Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to Oregon, east across the northern U.S. and Canada to eastern North America.
Habitat: Moist woods and streambanks.
Conservation Status: Not of concern
Perennial, dying back each winter, stems creeping to erect, lacking stolons.
Leaves monomorphic, 15-75 cm long and 10-30 cm broad; petiole 1/4-1/3 length of leaf; scales found at least at base, scattered, tan; blade light green, ovate-lanceolate, 2-3-pinnate-pinnafitid, not glandular; pinnae mostly in same plane as blade, lanceolate-oblong, basal pinnae lanceolate-deltate and slightly reduced, basal pinnules usually longer than others, basal basiscopic pinnule longer than basal acroscopic pinnule, pinnule margins serrate with spiny teeth.
Indusia glands absent, round-reniform, attached at narrow sinus; spores brownish.