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Spencer Collection, The New York Public Library. "Porphyra linearis" The New York Public Library Digital Collections. 1843-10 - 1844-05. https://qa-digitalcollections.nypl.org/items/792ee5f0-f22a-0134-58cc-3f81c3877370
Spencer Collection, The New York Public Library. "Porphyra linearis" New York Public Library Digital Collections. Accessed November 27, 2024. https://qa-digitalcollections.nypl.org/items/792ee5f0-f22a-0134-58cc-3f81c3877370
Spencer Collection, The New York Public Library. (1843-10 - 1844-05). Porphyra linearis Retrieved from https://qa-digitalcollections.nypl.org/items/792ee5f0-f22a-0134-58cc-3f81c3877370
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/792ee5f0-f22a-0134-58cc-3f81c3877370 | title=
(still image)
Porphyra linearis, (1843-10 - 1844-05)
|author=Digital Collections, The New York Public Library |accessdate=November 27, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>