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Montana Field Guide

Montana Field Guides

Northern Oak Fern - Gymnocarpium dryopteris
Other Names:  Gymnocarpium disjunctum

Global Rank: G5
State Rank: S4

Agency Status
MNPS Threat Rank:
C-value: 7

External Links

General Description
Plants with long, slender, scaly rhizomes. Leaves to 45 cm long, scattered, erect, petiole longer than blade. Leaf blade triangular, twice pinnate below but once above. Pinnae: lowest pair similar in size to the rest of blade. Pinnules pinnately lobed or toothed, glabrous or slightly glandular. Sori circular, borne on veins near margins on underside of fertile pinnules. Indusium lacking (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range

Range Comments
In MT scattered across the western third of the State, mostly west of the Continental Divide; AK to Greenland south to OR, AZ, NM, IL, and WV (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Summary of Observations Submitted for Montana
Number of Observations: 127

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
Relative Density



(Observations spanning multiple months or years are excluded from time charts)


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Citation for data on this website:
Northern Oak Fern — Gymnocarpium dryopteris.  Montana Field Guide.  .  Retrieved on , from