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Hymenophyllum (Filmy Fern) is a genus of herb in the family filmy-ferns. They are native to Puerto Rico, Canada, Alaska, U.S. Virgin Islands, Pacific Basin excluding Hawaii, Hawaii, and The Contiguous United States. They have bipinnate + pinnatifid leaves. Individuals can grow to 2.8 m. They have alternation of generations.

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EOL has data for 15 attributes, including:

Known occurrences, collected specimens and observations of filmy fern. View this species on GBIF