Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains; also in also in northeastern Canada and Greenland.
Habitat: Open talus and stream banks, mid-montane to subalpine.
Spores: May-September
Origin: Native
Conservation Status: Not of concern
[none provided]
Publication: Bot. Not. 126(4): 462. 1973.
Athyrium americanum (Butters) Maxon [KZ99, Peck]
Athyrium distentifolium Tausch ex Opiz var. americanum (Butters) Cronquist [VPPNW1, HC]
PNW Herbaria: Specimen records of Athyrium distentifolium ssp. americanum in the Consortium of Pacific Northwest Herbaria database.
WA Flora Checklist: Athyrium distentifolium ssp. americanum checklist entry.
OregonFlora: Athyrium distentifolium ssp. americanum information.
E-Flora BC: Athyrium distentifolium ssp. americanum atlas page.
CalPhotos: Athyrium distentifolium ssp. americanum photos.
USDA Plants: Athyrium distentifolium ssp. americanum information.
