| 
                                    Acrothrix novae-angliae W.R.Taylor
                                 | 
                                J. R. Smith s.n. | 
                                1928 | 
                                United States of America | 
                                Massachusetts | 
                                Barnstable Co. Woods Hole | 
                                — | 
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                                | 
                                    Antithamnion cruciatum (C.Agardh) Nägeli
                                 | 
                                J. R. Smith s.n. | 
                                1928 | 
                                United States of America | 
                                Massachusetts | 
                                Barnstable Co. Woods Hole | 
                                — | 
                                 | 
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                                | 
                                    Antithamnion cruciatum (C.Agardh) Nägeli
                                 | 
                                J. R. Smith s.n. | 
                                1928 | 
                                United States of America | 
                                Massachusetts | 
                                Barnstable Co. Woods Hole | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
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                                | 
                                    Antithamnion cruciatum (C.Agardh) Nägeli
                                 | 
                                J. R. Smith s.n. | 
                                s.d. | 
                                United States of America | 
                                Massachusetts | 
                                Woods Hole, Black Rock | 
                                — | 
                                 | 
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                                | 
                                    Bryopsis plumosa (Huds.) C.Agardh
                                 | 
                                J. R. Smith s.n. | 
                                1928 | 
                                United States of America | 
                                Massachusetts | 
                                Woods Hole, Black Rock | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
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                                | 
                                    Bryopsis plumosa (Huds.) C.Agardh
                                 | 
                                J. R. Smith s.n. | 
                                1928 | 
                                United States of America | 
                                Massachusetts | 
                                Woods Hole, Cuttyhunk | 
                                — | 
                                 | 
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                                | 
                                    Callithamnion baileyi Harv.
                                 | 
                                J. R. Smith s.n. | 
                                1928 | 
                                United States of America | 
                                Massachusetts | 
                                Barnstable Co. Black Rock | 
                                — | 
                                 | 
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                                | 
                                    Ceramium strictum (Kütz.) Harv.
                                 | 
                                J. R. Smith s.n. | 
                                1928 | 
                                United States of America | 
                                Massachusetts | 
                                Woods Hole, Black Rock | 
                                — | 
                                 | 
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                                | 
                                    Chaetomorpha aerea (Dillwyn) Kütz.
                                 | 
                                J. R. Smith s.n. | 
                                1928 | 
                                United States of America | 
                                Massachusetts | 
                                Barnstable Co. Woods Hole, Black… | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
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                                | 
                                    Chaetomorpha linum (O.F.Müll.) Kütz.
                                 | 
                                J. R. Smith s.n. | 
                                1928 | 
                                United States of America | 
                                Massachusetts | 
                                Barnstable Co. Woods Hole | 
                                — | 
                                 | 
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                                | 
                                    Champia parvula (C.Agardh) Harv.
                                 | 
                                J. R. Smith s.n. | 
                                1928 | 
                                United States of America | 
                                Massachusetts | 
                                Barnstable Co. Woods Hole | 
                                — | 
                                 | 
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                                | 
                                    Chondria baileyana (Mont.) Harv.
                                 | 
                                J. R. Smith s.n. | 
                                1928 | 
                                United States of America | 
                                Massachusetts | 
                                Barnstable Co. Woods Hole | 
                                — | 
                                 | 
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                                | 
                                    Chondrus crispus Stackh.
                                 | 
                                J. R. Smith s.n. | 
                                Jul | 
                                United States of America | 
                                New York | 
                                Suffolk Co. Long Island | 
                                — | 
                                 | 
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                                | 
                                    Chondrus crispus Stackh.
                                 | 
                                J. R. Smith s.n. | 
                                1928 | 
                                United States of America | 
                                Massachusetts | 
                                Woods Hole, Cuttyhunk | 
                                — | 
                                 | 
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                                | 
                                    Chorda filum (L.) Stackh.
                                 | 
                                J. R. Smith s.n. | 
                                1928 | 
                                United States of America | 
                                Massachusetts | 
                                Dukes Co. Penikese Island | 
                                — | 
                                 | 
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                                | 
                                    Chordaria flagelliformis (O.F.Müll.) C.Agardh
                                 | 
                                J. R. Smith s.n. | 
                                1928 | 
                                United States of America | 
                                Massachusetts | 
                                Barnstable Co. Nobska | 
                                — | 
                                 | 
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                                | 
                                    Chordaria flagelliformis (O.F.Müll.) C.Agardh
                                 | 
                                J. R. Smith s.n. | 
                                1928 | 
                                United States of America | 
                                Massachusetts | 
                                Barnstable Co. Woods Hole | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
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                                | 
                                    Cladophora
                                 | 
                                J. R. Smith s.n. | 
                                1928 | 
                                United States of America | 
                                Massachusetts | 
                                Woods Hole, Black Rock | 
                                — | 
                                 | 
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                                | 
                                    Cladophora
                                 | 
                                J. R. Smith s.n. | 
                                s.d. | 
                                — | 
                                — | 
                                [without locality] | 
                                — | 
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                                | 
                                    Corallina officinalis L.
                                 | 
                                J. R. Smith s.n. | 
                                1928 | 
                                United States of America | 
                                Massachusetts | 
                                Woods Hole, Black Rock | 
                                — | 
                                 | 
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                                | 
                                    Cystoclonium
                                 | 
                                J. R. Smith s.n. | 
                                1928 | 
                                United States of America | 
                                Massachusetts | 
                                Barnstable Co. Woods Hole | 
                                — | 
                                 | 
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                                | 
                                    Cystoclonium purpurascens (Huds.) Kütz.
                                 | 
                                J. R. Smith s.n. | 
                                1928 | 
                                United States of America | 
                                Massachusetts | 
                                Barnstable Co. Woods Hole | 
                                — | 
                                 | 
                                 | 
                                
                                                                      
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                                | 
                                    Cystoclonium purpurascens (Huds.) Kütz.
                                 | 
                                J. R. Smith s.n. | 
                                1928 | 
                                United States of America | 
                                Massachusetts | 
                                Barnstable Co. Woods Hole | 
                                — | 
                                 | 
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                                | 
                                    Desmarestia viridis (O.F.Müll.) J.V.Lamour.
                                 | 
                                J. R. Smith s.n. | 
                                1928 | 
                                United States of America | 
                                Massachusetts | 
                                Barnstable Co. Nobska | 
                                — | 
                                 | 
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                                | 
                                    Ectocarpus confervoides Harv.
                                 | 
                                J. R. Smith s.n. | 
                                1928 | 
                                United States of America | 
                                Massachusetts | 
                                Barnstable Co. Woods Hole | 
                                — | 
                                 | 
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