Gymnocarpium dryopteris

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Gymnocarpium dryopteris
Gymnocarpium dryopteris 0318.JPG
Conservation status

Secure (NatureServe)
Scientific classification
Kingdom: Plantae
Division: Pteridophyta
Class: Pteridopsida
Order: Polypodiales
(unranked): Eupolypods II
Family: Cystopteridaceae
Genus: Gymnocarpium
Species: G. dryopteris
Binomial name
Gymnocarpium dryopteris
(L.) Newman

Dryopteris dryopteris (L.) Britton
Dryopteris disjuncta (Rupr.) C.V.Morton
Dryopteris linnaeana C. Chr.
Lastrea dryopteris (L.) Bory
Phegopteris dryopteris (L.) Fée
Thelypteris dryopteris (L.) Sloss.

Gymnocarpium dryopteris (Western Oakfern, Common Oak Fern, Oak Fern[1] or Northern Oak Fern) is a fern of the family Cystopteridaceae.


Gymnocarpium dryopteris has small, delicate fronds with ternately-compound pinnae (leaves). Fronds occur singly. On the underside of matured pinnae naked sori can be found. Grows to about 1ft in height.


Common in the Canadian forests and the Northwestern United States. It is also found in Scotland and Scandinavia, Finland, and Russia.[2][3] Its name is debated also as gymnocarpium dysjunctum. Oakfern may be a translation of dryoteris.[citation needed]

This species, a forest understory plant, is not found in association with Quercus (oak).[4][5]


  1. ^ "BSBI List 2007". Botanical Society of Britain and Ireland. Archived from the original (XLS) on 2015-02-25. Retrieved 2014-10-17. 
  2. ^ "Gymnocarpium dryopteris". WTU Herbarium Image Collection. Burke Museum, University of Washington. Retrieved 2009-12-20. 
  3. ^ "Gymnocarpium dryopteris (L.) Newman". PLANTS Profile. United States Department of Agriculture; Natural Resources Conservation Service. Retrieved 2009-12-20. 
  4. ^ Plants of the Pacific Northwest Coast: Washington, Oregon, British Columbia & Alaska, Written by Paul Alaback, ISBN 978-1-55105-530-5
  5. ^ Pojar, Jim; Andy MacKinnon (1994). Plants of the Pacific Northwest. Lone Pine Publishing. p. 423. ISBN 1-55105-042-0. 

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