Page authors: Don Knoke, David Giblin
Dryopteris expansa
northern fern, spreading wood fern
WTU specimens
Other herbaria
WTU images

Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to Alberta, Idaho, and Montana.

Habitat: Moist to wet woods and streambanks.

Origin: Native

Conservation Status: Not of concern


[none provided]

Accepted Name:
Dryopteris expansa (C. Presl) Fraser-Jenk. & Jermy
Publication: Brit. Fern Gaz. 11: 338. 1977. 1977.

Synonyms & Misapplications:
Dryopteris assimilis S. Walker
Dryopteris campyloptera (Kunze) Clarkson, misapplied [FNA2]
Dryopteris dilatata (Hoffm.) A. Gray, misapplied [Abrams, Peck]
Dryopteris dilitata (Hoffm.) A. Gray var. americana (Fisch.) Hultén
Nephrodium expansum C. Presl
Additional Resources:

PNW Herbaria: Specimen records of Dryopteris expansa in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Dryopteris expansa checklist entry.

E-Flora BC: Dryopteris expansa atlas page.

CalPhotos: Dryopteris expansa photos.

USDA Plants: Dryopteris expansa information.

15 photographs:
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