| 
                                    Entocladia flustrae (Reinke) W.R.Taylor
                                 | 
                                I. Holden s.n. | 
                                s.d. | 
                                United States of America | 
                                California | 
                                 | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
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                                | 
                                    Macrocystis pyrifera (L.) C.Agardh
                                 | 
                                I. Holden s.n. | 
                                s.d. | 
                                United States of America | 
                                California | 
                                 | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
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                                 | 
                            
                       
                        
                            
                            
                                | 
                                    Leptomitus lacteus (Roth) C.Agardh
                                 | 
                                I. Holden s.n. | 
                                27 Jun 1889 | 
                                United States of America | 
                                Colorado | 
                                In brook below a "tripe… | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
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                                | 
                                    Oscillatoria tenuis C.Agardh ex Gomont
                                 | 
                                I. Holden s.n. | 
                                05 Oct 1890 | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. Bruce's Brook | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
                                                                  | 
                                
                                    
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                                | 
                                    Oscillatoria tenuis C.Agardh ex Gomont
                                 | 
                                I. Holden s.n. | 
                                s.d. | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. Pequonnock River | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
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                                 | 
                            
                       
                        
                            
                            
                                | 
                                    Spirogyra porticalis f. minor Collins
                                 | 
                                I. Holden s.n. | 
                                08 May 1892 | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. among other (sterile)… | 
                                type | 
                                 | 
                                 | 
                                
                                                                      
                                                                  | 
                                
                                    
                                 | 
                            
                       
                        
                            
                            
                                | 
                                    Didymoprium grevillei
                                 | 
                                I. Holden s.n. | 
                                11 May 1890 | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. Stillman's Pond | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
                                                                  | 
                                
                                    
                                 | 
                            
                       
                        
                            
                            
                                | 
                                    Didymoprium grevillei
                                 | 
                                I. Holden s.n. | 
                                11 May 1890 | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. Stillman's Pond | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
                                                                  | 
                                
                                    
                                 | 
                            
                       
                        
                            
                            
                                | 
                                    Mougeotia genuflexa (Roth) C.Agardh
                                 | 
                                I. Holden 668 | 
                                02 Aug 1892 | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. Peck's Mill Pond,… | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
                                                                  | 
                                
                                    
                                 | 
                            
                       
                        
                            
                            
                                | 
                                    Mougeotia genuflexa (Roth) C.Agardh
                                 | 
                                I. Holden s.n. | 
                                01 Jul 1894 | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. Putney, Peck's Mill… | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
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                                 | 
                            
                       
                        
                            
                            
                                | 
                                    Mougeotia genuflexa (Roth) C.Agardh
                                 | 
                                I. Holden s.n. | 
                                01 Jul 1894 | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. Putney, Peck's Mill… | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
                                                                  | 
                                
                                    
                                 | 
                            
                       
                        
                            
                            
                                | 
                                    Mougeotia genuflexa (Roth) C.Agardh
                                 | 
                                I. Holden s.n. | 
                                01 Jul 1894 | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. Putney, Peck's Mill… | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
                                                                  | 
                                
                                    
                                 | 
                            
                       
                        
                            
                            
                                | 
                                    Mougeotia robusta (de Bary) Wittr.
                                 | 
                                I. Holden s.n. | 
                                05 Jun 1892 | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. Pequonnock River | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
                                                                  | 
                                
                                    
                                 | 
                            
                       
                        
                            
                            
                                | 
                                    Zygogonium anomalum Kütz.
                                 | 
                                I. Holden s.n. | 
                                12 Jun 1892 | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. Pequonnock River | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
                                                                  | 
                                
                                    
                                 | 
                            
                       
                        
                            
                            
                                | 
                                    Porphyra leucosticta Thur.
                                 | 
                                I. Holden s.n. | 
                                18 Apr 1897 | 
                                United States of America | 
                                Connecticut | 
                                Bridgeport Harbor | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
                                                                  | 
                                
                                    
                                 | 
                            
                       
                        
                            
                            
                                | 
                                    Porphyra leucosticta Thur.
                                 | 
                                I. Holden s.n. | 
                                26 Mar 1890 | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. Sea Side Park | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
                                                                  | 
                                
                                    
                                 | 
                            
                       
                        
                            
                            
                                | 
                                    Porphyra leucosticta Thur.
                                 | 
                                I. Holden  | 
                                18 Apr 1897 | 
                                United States of America | 
                                Connecticut | 
                                Bridgeport Harbor | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
                                                                  | 
                                
                                    
                                 | 
                            
                       
                        
                            
                            
                                | 
                                    Porphyra purpurea (Roth) C.Agardh
                                 | 
                                I. Holden s.n. | 
                                26 Aug 1888 | 
                                United States of America | 
                                Connecticut | 
                                Thimble Island | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
                                                                  | 
                                
                                    
                                 | 
                            
                       
                        
                            
                            
                                | 
                                    Bangia fuscopurpurea (Dillwyn) Lyngb.
                                 | 
                                I. Holden s.n. | 
                                30 Nov 1893 | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. between tide marks | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
                                                                  | 
                                
                                    
                                 | 
                            
                       
                        
                            
                            
                                | 
                                    Draparnaldia plumosa (Vaucher) C.Agardh
                                 | 
                                I. Holden s.n. | 
                                14 Feb 1892 | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. attached to stones… | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
                                                                  | 
                                
                                    
                                 | 
                            
                       
                        
                            
                            
                                | 
                                    Oedogonium boscii Wittr. ex Hirn
                                 | 
                                I. Holden s.n. | 
                                02 Jul 1893 | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. on submerged plants… | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
                                                                  | 
                                
                                    
                                 | 
                            
                       
                        
                            
                            
                                | 
                                    Oedogonium boscii Wittr. ex Hirn
                                 | 
                                I. Holden s.n. | 
                                02 Jul 1893 | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. on submerged plants… | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
                                                                  | 
                                
                                    
                                 | 
                            
                       
                        
                            
                            
                                | 
                                    Stigeoclonium flagelliferum Kütz.
                                 | 
                                I. Holden s.n. | 
                                25 Dec 1895 | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. Pequonnock River | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
                                                                  | 
                                
                                    
                                 | 
                            
                       
                        
                            
                            
                                | 
                                    Stigeoclonium flagelliferum Kütz.
                                 | 
                                I. Holden 1171 | 
                                22 Dec 1895 | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. Pequonnock River | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
                                                                  | 
                                
                                    
                                 | 
                            
                       
                        
                            
                            
                                | 
                                    Chaetomorpha linum (O.F.Müll.) Kütz.
                                 | 
                                I. Holden 688 | 
                                13 Aug 1892 | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
                                                                  | 
                                
                                    
                                 | 
                            
                       
                        
                            
                            
                                | 
                                    Chaetomorpha linum (O.F.Müll.) Kütz.
                                 | 
                                I. Holden s.n. | 
                                13 Aug 1892 | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. on rocks and… | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
                                                                  | 
                                
                                    
                                 | 
                            
                       
                        
                            
                            
                                | 
                                    Trentepohlia aurea (L.) Mart.
                                 | 
                                I. Holden s.n. | 
                                09 Oct 1898 | 
                                United States of America | 
                                Connecticut | 
                                Litchfield Co. near Gaylordsville, on… | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
                                                                  | 
                                
                                    
                                 | 
                            
                       
                        
                            
                            
                                | 
                                    Ulothrix
                                 | 
                                I. Holden 657 | 
                                25 Jul 1892 | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. Pequonnock River | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
                                                                  | 
                                
                                    
                                 | 
                            
                       
                        
                            
                            
                                | 
                                    Ulothrix zonata (F.Weber & D.Mohr) Kütz.
                                 | 
                                I. Holden s.n. | 
                                03 Jan 1894 | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. Mill River, abundant… | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
                                                                  | 
                                
                                    
                                 | 
                            
                       
                        
                            
                            
                                | 
                                    Ulothrix zonata (F.Weber & D.Mohr) Kütz.
                                 | 
                                I. Holden s.n. | 
                                03 Jan 1894 | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. Mill River, abundant… | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
                                                                  | 
                                
                                    
                                 | 
                            
                       
                        
                            
                            
                                | 
                                    Ulva linza L.
                                 | 
                                I. Holden s.n. | 
                                26 Jul 1891 | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. Long Beach | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
                                                                  | 
                                
                                    
                                 | 
                            
                       
                        
                            
                            
                                | 
                                    Ulva prolifera O.F.Müll.
                                 | 
                                I. Holden s.n. | 
                                11 Jun 1873 | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. Bridgeport Harbor | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
                                                                  | 
                                
                                    
                                 | 
                            
                       
                        
                            
                            
                                | 
                                    Ulva prolifera O.F.Müll.
                                 | 
                                I. Holden s.n. | 
                                30 May 1891 | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
                                                                  | 
                                
                                    
                                 | 
                            
                       
                        
                            
                            
                                | 
                                    Acrochaetium sagraeanum (Mont.) Bornet
                                 | 
                                I. Holden s.n. | 
                                — | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
                                                                  | 
                                
                                    
                                 | 
                            
                       
                        
                            
                            
                                | 
                                    Batrachospermum
                                 | 
                                I. Holden s.n. | 
                                09 May 1886 | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
                                                                  | 
                                
                                    
                                 | 
                            
                       
                        
                            
                            
                                | 
                                    Batrachospermum gelatinosum (L.) DC.
                                 | 
                                I. Holden s.n. | 
                                06 May 1893 | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. on dead sticks… | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
                                                                  | 
                                
                                    
                                 | 
                            
                       
                        
                            
                            
                                | 
                                    Batrachospermum gelatinosum (L.) DC.
                                 | 
                                I. Holden s.n. | 
                                26 Jan 1890 | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. Pequonnock River | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
                                                                  | 
                                
                                    
                                 | 
                            
                       
                        
                            
                            
                                | 
                                    Batrachospermum gelatinosum (L.) DC.
                                 | 
                                I. Holden s.n. | 
                                11 May 1890 | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. on sticks and… | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
                                                                  | 
                                
                                    
                                 | 
                            
                       
                        
                            
                            
                                | 
                                    Batrachospermum gelatinosum (L.) DC.
                                 | 
                                I. Holden s.n. | 
                                11 May 1890 | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. on sticks and… | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
                                                                  | 
                                
                                    
                                 | 
                            
                       
                        
                            
                            
                                | 
                                    Batrachospermum gelatinosum (L.) DC.
                                 | 
                                I. Holden s.n. | 
                                s.d. | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. in a brook | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
                                                                  | 
                                
                                    
                                 | 
                            
                       
                        
                            
                            
                                | 
                                    Batrachospermum gelatinosum (L.) DC.
                                 | 
                                I. Holden s.n. | 
                                07 Dec 1890 | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. Pequonnock River | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
                                                                  | 
                                
                                    
                                 | 
                            
                       
                        
                            
                            
                                | 
                                    Batrachospermum gelatinosum (L.) DC.
                                 | 
                                I. Holden s.n. | 
                                27 Oct 1889 | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. Pequonnock River | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
                                                                  | 
                                
                                    
                                 | 
                            
                       
                        
                            
                            
                                | 
                                    Batrachospermum gelatinosum (L.) DC.
                                 | 
                                I. Holden s.n. | 
                                s.d. | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. in a brook | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
                                                                  | 
                                
                                    
                                 | 
                            
                       
                        
                            
                            
                                | 
                                    Batrachospermum gelatinosum (L.) DC.
                                 | 
                                I. Holden s.n. | 
                                s.d. | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. in a brook | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
                                                                  | 
                                
                                    
                                 | 
                            
                       
                        
                            
                            
                                | 
                                    Batrachospermum gelatinosum (L.) DC.
                                 | 
                                I. Holden s.n. | 
                                s.d. | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. on sticks and… | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
                                                                  | 
                                
                                    
                                 | 
                            
                       
                        
                            
                            
                                | 
                                    Batrachospermum gelatinosum (L.) DC.
                                 | 
                                I. Holden s.n. | 
                                s.d. | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. in a brook | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
                                                                  | 
                                
                                    
                                 | 
                            
                       
                        
                            
                            
                                | 
                                    Batrachospermum keratophytum Bory
                                 | 
                                I. Holden s.n. | 
                                24 Dec 1893 | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. on submerged alder… | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
                                                                  | 
                                
                                    
                                 | 
                            
                       
                        
                            
                            
                                | 
                                    Batrachospermum keratophytum Bory
                                 | 
                                I. Holden s.n. | 
                                09 Jul 1892 | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. on submerged alder… | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
                                                                  | 
                                
                                    
                                 | 
                            
                       
                        
                            
                            
                                | 
                                    Callithamnion baileyi Harv.
                                 | 
                                I. Holden s.n. | 
                                s.d. | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. Bridgeport | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
                                                                  | 
                                
                                    
                                 | 
                            
                       
                        
                            
                            
                                | 
                                    Callithamnion baileyi Harv.
                                 | 
                                I. Holden s.n. | 
                                s.d. | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. Bridgeport | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
                                                                  | 
                                
                                    
                                 |