[FPN] Hitchcock & Cronquist, 1998
Flora of the Pacific Northwest (11th ed.); ISBN 0-295-95273-3
[TFG] Edgar T. Therry, ?1995
The Fern Guide: Northeasten and Midland United States and Adjacent Canada; [Original publication 1961]
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Keep in mind that the taxonomic information is copied from various sources, and may include many inaccuracies. Expert help is welcome.