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Montana Field Guide

Montana Field Guides

Spreading Woodfern - Dryopteris expansa
Other Names:  Dryopteris dilatata

Status Under Review

Global Rank: G5
State Rank: S3?
* (see State Rank Reason below)

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank:
C-value: 8

External Links






State Rank Reason (see State Rank above)
28 collections at MONTU from 9 different counties.
  • Details on Status Ranking and Review
    Spreading Woodfern (Dryopteris expansa) Conservation Status Review
    Review Date =
 
General Description
Leaves monomorphic, up to 90 cm long; petiole ca. 1/2 as long as blade. Leaf blade green, narrowly triangular, twice pinnate, glandular or not. Pinnules deeply pinnately lobed, downward pointing ones on lower pinnae longer than those pointing upward. Indusium with or without glands (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range
Present
 


Range Comments
In MT in the western third east to Carbon County; Greenland and Europe, AK to CA, MT and ON to NL (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 8

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

Recency

 

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



Habitat
Mesic, shady forests, often along streams and beneath shrubs; valleys to montane (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

References
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Citation for data on this website:
Spreading Woodfern — Dryopteris expansa.  Montana Field Guide.  .  Retrieved on , from