– Pacific oak-fern, western oak-fern
Distribution: Occurring in forested areas on both sides of the Cascades crest except in southeastern Washington; Alaska to Oregon, east to Alberta, Idaho, and Montana, and disjunct in Wyoming; circumboreal.
Habitat: Moist woods, streambanks and wet cliffs.
– common fern, northern oak fern
Distribution: Both sides of the Cascades in Washington; Alaska east across northern Canada, south to northern U.S., with disjunct populations scattered throughout western North America.
Habitat: Forest understory, often where moist