Gymnocarpium dryopteris (Oak Fern) is a species of perennial herb in the family Cystopteridaceae. They have a self-supporting growth form. They are native to Western North America, United States, Greenland, Saint-Pierre Et Miquelon, The Contiguous United States, Canada, and Alaska. They have simple, simple leaves. Individuals can grow to 0.25 m. They have alternation of generations.
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