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Montana Field Guide

Montana Field Guides

Maidenhair Spleenwort - Asplenium trichomanes

Potential Species of Concern
Native Species

Global Rank: G5
State Rank: SH
* (see State Rank Reason below)

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

External Links






State Rank Reason (see State Rank above)
Known from one 1895 collection with imprecise location data near "Columbia Falls" in Flathead County.
  • Details on Status Ranking and Review
    Maidenhair Spleenwort (Asplenium trichomanes) Conservation Status Review
    Review Date =
 
General Description
Maidenhair Spleenwort is a perennial with short rhizomes and glabrous, evergreen fronds clustered from the base of the plant. Each frond is 7-35 cm long, and is pinnately divided into numerous pinnae that are arranged alternately on the shiny, reddish-brown central axis (rachis) of the frond. The naked petioles and central axes tend to persist after the pinnae have fallen; each pinna is 5 mm wide and entire-margined below, but shallowly lobed toward the tip. Spores are borne in 1-4 clusters arranged along the veins on the undersides of the pinnae; the spores are partially enfolded by a thin, white tissue, the indusium.

Phenology
Fronds mature in June-July.

Diagnostic Characteristics
This species can be distinguished from the more common A. viride by its shiny, reddish-brown leaf stems.

Species Range
Unknown/Undetermined
 


Range Comments
One MT collection from Flathead County over 100 years ago; circumboreal south to CA, AZ, NM GA, and Mexico (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
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
Moist rock crevices and talus slopes in the montane zone.

References
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Citation for data on this website:
Maidenhair Spleenwort — Asplenium trichomanes.  Montana Field Guide.  .  Retrieved on , from