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Spencer Collection, The New York Public Library. "Polysiphonia atro-rubescens" The New York Public Library Digital Collections. 1845-11 - 1846-06. https://digitalcollections.nypl.org/items/16648690-f22b-0134-1285-0d58343e8e5c
Spencer Collection, The New York Public Library. "Polysiphonia atro-rubescens" New York Public Library Digital Collections. Accessed January 16, 2025. https://digitalcollections.nypl.org/items/16648690-f22b-0134-1285-0d58343e8e5c
Spencer Collection, The New York Public Library. (1845-11 - 1846-06). Polysiphonia atro-rubescens Retrieved from https://digitalcollections.nypl.org/items/16648690-f22b-0134-1285-0d58343e8e5c
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/16648690-f22b-0134-1285-0d58343e8e5c | title=
(still image)
Polysiphonia atro-rubescens, (1845-11 - 1846-06)
|author=Digital Collections, The New York Public Library |accessdate=January 16, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>