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Montana Field Guide

Montana Field Guides

Maidenhair Fern - Adiantum aleuticum
Other Names:  Adiantum pedatum ssp. aleuticum


Global Rank: G5?
State Rank: S3S4

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank:
C-value: 7

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General Description
Plants with a short, stout, horizontal or ascending rhizome. Leaves monomorphic, arching to erect, 10–60 cm long with a glabrous, shiny, black petiole; the blades fan-shaped, appearing palmately divided into several pinnately divided pinnae. Pinnae with 15 to 35 light green, fan-shaped to oblong pinnules, 10–25 mm long with jagged apical margins. Sori crescent-shaped, borne on edges of pinnules, covered by inrolled margins (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range
Present
 


Range Comments
In MT only in the northwestern counties south to Ravalli and Deer Lodge counties; AK to NL south to CA, AZ, CO, PA, and disjunct in Mexico (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Summary of Observations Submitted for Montana
Number of Observations: 1

(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
Wet rock crevices or shallow soil of cliffs, occasional in damp forest, usually in partial shade; montane, subalpine (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

References
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Citation for data on this website:
Maidenhair Fern — Adiantum aleuticum.  Montana Field Guide.  .  Retrieved on , from