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Farwell, Oliver Atkins (1931). «Fern Notes II. Ferns in the Herbarium of Parke, Davis & co». American Midland Naturalist. 12 (8). pp.233–311. JSTOR2420088. doi:10.2307/2420088|acessodata= requer |url= (ajuda)
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Belling, Alice J.; Heusser, Calvin J. (1975). «Spore Morphology of the Polypodiaceae of Northeastern North America. II». Bulletin of the Torrey Botanical Club. 102 (3): 115–127. JSTOR2484733. doi:10.2307/2484733|acessodata= requer |url= (ajuda)
Farwell, Oliver Atkins (1931). «Fern Notes II. Ferns in the Herbarium of Parke, Davis & co». American Midland Naturalist. 12 (8). pp.233–311. JSTOR2420088. doi:10.2307/2420088|acessodata= requer |url= (ajuda)
Miller, E. S. (1873). «Suffolk Co.-Wading River». Bulletin of the Torrey Botanical Club. 4 (9). pp.41–42. JSTOR2476976|acessodata= requer |url= (ajuda)