| 
                                    Acrochaetium sagraeanum (Mont.) Bornet
                                 | 
                                I. Holden s.n. | 
                                — | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
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                                | 
                                    Acrochaetium sagraeanum (Mont.) Bornet
                                 | 
                                I. Holden s.n. | 
                                28 Aug 1892 | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. in the brackish… | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
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                                | 
                                    Agardhiella tenera (J.Agardh) F.Schmitz
                                 | 
                                I. Holden s.n. | 
                                03 Sep 1898 | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. washed ashore | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
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                                | 
                                    Agardhiella tenera (J.Agardh) F.Schmitz
                                 | 
                                I. Holden s.n. | 
                                03 Sep 1898 | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. washed ashore | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
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                                | 
                                    Agardhiella tenera (J.Agardh) F.Schmitz
                                 | 
                                I. Holden s.n. | 
                                03 Sep 1898 | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. washed ashore | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
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                                | 
                                    Agardhiella tenera (J.Agardh) F.Schmitz
                                 | 
                                I. Holden s.n. | 
                                03 Sep 1898 | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. washed ashore | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
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                                | 
                                    Agardhiella tenera (J.Agardh) F.Schmitz
                                 | 
                                I. Holden s.n. | 
                                22 Aug 1886 | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. Bridgeport | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
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                                | 
                                    Agardhiella tenera (J.Agardh) F.Schmitz
                                 | 
                                I. Holden s.n. | 
                                03 Sep 1898 | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. washed ashore | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
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                                | 
                                    Agarum turneri Postels & Rupr.
                                 | 
                                I. Holden s.n. | 
                                28 Oct 1888 | 
                                United States of America | 
                                Massachusetts | 
                                Essex Co. Little Nahant | 
                                — | 
                                 | 
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                                | 
                                    Antithamnion americanum (Harv.) Kjellm.
                                 | 
                                I. Holden s.n. | 
                                s.d. | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. below low water… | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
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                                | 
                                    Antithamnion americanum (Harv.) Kjellm.
                                 | 
                                I. Holden 1348 | 
                                — | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. Bridgeport | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
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                                | 
                                    Antithamnion americanum (Harv.) Kjellm.
                                 | 
                                I. Holden s.n. | 
                                s.d. | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. below low water… | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
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                                | 
                                    Antithamnion cruciatum (C.Agardh) Nägeli
                                 | 
                                I. Holden s.n. | 
                                13 Dec 1891 | 
                                — | 
                                — | 
                                Bridgeport [illegible] | 
                                — | 
                                 | 
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                                | 
                                    Antithamnion cruciatum (C.Agardh) Nägeli
                                 | 
                                I. Holden s.n. | 
                                — | 
                                — | 
                                — | 
                                Bridgeport [illegible] | 
                                — | 
                                 | 
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                                | 
                                    Arthrospira gomontiana Setch.
                                 | 
                                W. A. Setchell | I. Holden 744 | 
                                Sep 1889 | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. on Factory Pond | 
                                type | 
                                 | 
                                 | 
                                
                                                                      
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                                 | 
                            
                       
                        
                            
                            
                                | 
                                    Arthrospira gomontiana Setch.
                                 | 
                                W. A. Setchell | I. Holden s.n. | 
                                07 Jul 1895 | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. on the pool… | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
                                                                  | 
                                
                                    
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                                | 
                                    Ascocyclus foecundus (Strömf.) Reinke
                                 | 
                                I. Holden s.n. | 
                                12 May 1887 | 
                                United States of America | 
                                Connecticut | 
                                Penfield Reef, L. I. Sound | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
                                                                  | 
                                
                                    
                                 | 
                            
                       
                        
                            
                            
                                | 
                                    Ascophyllum mackayi (W.B.Turner) Holmes & Batters
                                 | 
                                I. Holden s.n. | 
                                Apr 1895 - May 1895 | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. resting on mud… | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
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                                | 
                                    Ascophyllum mackayi (W.B.Turner) Holmes & Batters
                                 | 
                                I. Holden s.n. | 
                                Apr 1895 - May 1895 | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. resting on mud… | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
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                                | 
                                    Ascophyllum mackayi (W.B.Turner) Holmes & Batters
                                 | 
                                I. Holden s.n. | 
                                — | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. On shore between… | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
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                                | 
                                    Ascophyllum mackayi (W.B.Turner) Holmes & Batters
                                 | 
                                I. Holden s.n. | 
                                s.d. | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. Bridgeport | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
                                                                  | 
                                
                                    
                                 | 
                            
                       
                        
                            
                            
                                | 
                                    Ascophyllum mackayi (W.B.Turner) Holmes & Batters
                                 | 
                                I. Holden s.n. | 
                                Mar 1891 | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. Bridgeport | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
                                                                  | 
                                
                                    
                                 | 
                            
                       
                        
                            
                            
                                | 
                                    Ascophyllum mackayi (W.B.Turner) Holmes & Batters
                                 | 
                                I. Holden s.n. | 
                                Mar 1891 | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. Bridgeport | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
                                                                  | 
                                
                                    
                                 | 
                            
                       
                        
                            
                            
                                | 
                                    Ascophyllum mackayi (W.B.Turner) Holmes & Batters
                                 | 
                                I. Holden s.n. | 
                                Apr 1895 - May 1895 | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. resting on mud… | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
                                                                  | 
                                
                                    
                                 | 
                            
                       
                        
                            
                            
                                | 
                                    Ascophyllum nodosum (L.) Le Jol.
                                 | 
                                I. Holden s.n. | 
                                May 1899 | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. on rocks in… | 
                                — | 
                                 | 
                                 | 
                                
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                                 | 
                            
                       
                        
                            
                            
                                | 
                                    Ascophyllum nodosum (L.) Le Jol.
                                 | 
                                I. Holden s.n. | 
                                May 1899 | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. on rocks in… | 
                                — | 
                                 | 
                                 | 
                                
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                                 | 
                            
                       
                        
                            
                            
                                | 
                                    Ascophyllum nodosum (L.) Le Jol.
                                 | 
                                I. Holden s.n. | 
                                May 1899 | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. on rocks in… | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
                                                                  | 
                                
                                    
                                 | 
                            
                       
                        
                            
                            
                                | 
                                    Ascophyllum nodosum (L.) Le Jol.
                                 | 
                                I. Holden s.n. | 
                                May 1899 | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. on rocks in… | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
                                                                  | 
                                
                                    
                                 | 
                            
                       
                        
                            
                            
                                | 
                                    Ascophyllum nodosum (L.) Le Jol.
                                 | 
                                I. Holden s.n. | 
                                May 1899 | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. on rocks in… | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
                                                                  | 
                                
                                    
                                 | 
                            
                       
                        
                            
                            
                                | 
                                    Ascophyllum nodosum (L.) Le Jol.
                                 | 
                                I. Holden s.n. | 
                                May 1887 | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. Seaside Park | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
                                                                  | 
                                
                                    
                                 | 
                            
                       
                        
                            
                            
                                | 
                                    Asplenium biscayneanum A.A.Eaton
                                 | 
                                I. Holden s.n. | 
                                28 Feb 1887 | 
                                United States of America | 
                                Florida | 
                                Biscayne Bay | 
                                — | 
                                 | 
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                                | 
                                    Asplenium verecundum Chapm.
                                 | 
                                I. Holden s.n. | 
                                28 Feb 1887 | 
                                United States of America | 
                                Florida | 
                                Biscayne Bay | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
                                                                  | 
                                
                                    
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                                | 
                                    Audouinella alariae (Jónss.) Woelk.
                                 | 
                                I. Holden 134 | 
                                09 Mar 1903 | 
                                United States of America | 
                                Maine | 
                                Sea Wall, Mt. Desert | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
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                                | 
                                    Bangia
                                 | 
                                I. Holden s.n. | 
                                13 Dec 1891 | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. Seaside Park | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
                                                                  | 
                                
                                    
                                 | 
                            
                       
                        
                            
                            
                                | 
                                    Bangia ciliaris Carmich.
                                 | 
                                I. Holden s.n. | 
                                05 Nov 1893 | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. on Fucus | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
                                                                  | 
                                
                                    
                                 | 
                            
                       
                        
                            
                            
                                | 
                                    Bangia ciliaris Carmich.
                                 | 
                                I. Holden s.n. | 
                                05 Nov 1893 | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. on Fucus | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
                                                                  | 
                                
                                    
                                 | 
                            
                       
                        
                            
                            
                                | 
                                    Bangia ciliaris Carmich.
                                 | 
                                I. Holden s.n. | 
                                05 Nov 1893 | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. on Fucus | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
                                                                  | 
                                
                                    
                                 | 
                            
                       
                        
                            
                            
                                | 
                                    Bangia fuscopurpurea (Dillwyn) Lyngb.
                                 | 
                                I. Holden 129 | 
                                11 Aug 1890 | 
                                United States of America | 
                                Maine | 
                                Hancock Co. Mount Desert, Seal… | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
                                                                  | 
                                
                                    
                                 | 
                            
                       
                        
                            
                            
                                | 
                                    Bangia fuscopurpurea (Dillwyn) Lyngb.
                                 | 
                                I. Holden s.n. | 
                                30 Nov 1893 | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. between tide marks | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
                                                                  | 
                                
                                    
                                 | 
                            
                       
                        
                            
                            
                                | 
                                    Bangia fuscopurpurea (Dillwyn) Lyngb.
                                 | 
                                I. Holden s.n. | 
                                30 Nov 1893 | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. between tide marks | 
                                — | 
                                 | 
                                 | 
                                
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                                | 
                                    Batrachospermum
                                 | 
                                I. Holden s.n. | 
                                09 May 1886 | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
                                                                  | 
                                
                                    
                                 | 
                            
                       
                        
                            
                            
                                | 
                                    Batrachospermum
                                 | 
                                I. Holden s.n. | 
                                20 Oct 1889 | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. Island Brook | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
                                                                  | 
                                
                                    
                                 | 
                            
                       
                        
                            
                            
                                | 
                                    Batrachospermum
                                 | 
                                I. Holden s.n. | 
                                02 Feb 1890 | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. Side stream of… | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
                                                                  | 
                                
                                    
                                 | 
                            
                       
                        
                            
                            
                                | 
                                    Batrachospermum boryanum Sirodot
                                 | 
                                I. Holden s.n. | 
                                13 Mar 1892 | 
                                United States of America | 
                                Connecticut | 
                                Bridgeport and Stratford, in running… | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
                                                                  | 
                                
                                    
                                 | 
                            
                       
                        
                            
                            
                                | 
                                    Batrachospermum corbula Sirodot
                                 | 
                                I. Holden s.n. | 
                                11 May 1890 | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. on sticks and… | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
                                                                  | 
                                
                                    
                                 | 
                            
                       
                        
                            
                            
                                | 
                                    Batrachospermum densum Sirodot
                                 | 
                                I. Holden 105 | 
                                07 Aug 1890 | 
                                United States of America | 
                                Maine | 
                                Mt. Desert Island, outlet of… | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
                                                                  | 
                                
                                    
                                 | 
                            
                       
                        
                            
                            
                                | 
                                    Batrachospermum ectocarpum Sirodot
                                 | 
                                I. Holden s.n. | 
                                13 Apr 1890 | 
                                United States of America | 
                                Connecticut | 
                                Fairfield Co. in running brooks | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
                                                                  | 
                                
                                    
                                 | 
                            
                       
                        
                            
                            
                                | 
                                    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. | 
                                02 Aug 1890 | 
                                United States of America | 
                                Maine | 
                                Hancock Co. Southwest Harbor | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
                                                                  | 
                                
                                    
                                 | 
                            
                       
                        
                            
                            
                                | 
                                    Batrachospermum gelatinosum (L.) DC.
                                 | 
                                I. Holden 87 | 
                                16 Mar 1890 | 
                                United States of America | 
                                Massachusetts | 
                                Middlesex Fells | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
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                                 |