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Montana Field Guide

Montana Field Guides

Mountain Bladder Fern - Cystopteris montana

Potential Species of Concern

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

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

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State Rank Reason (see State Rank above)
Reported for Montana from one collection in 1932 near Gunsight Pass in Glacier National Park.
 
General Description
Mountain Bladder Fern has delicate fronds arising singly from dark, cord-like, creeping rhizomes. The black, sparsely scaly petioles, 6-30 cm long, are longer than the triangular blades, which are 6-14 cm long and wide. The blade is pinnately divided into numerous pairs of leaflets, which become smaller towards the tip. The lower leaflets are again 2-3 times pinnately divided, while the upper leaflets are only pinnately lobed. The first downward pointing division of each of the 2 lowest leaflets is noticeably longer than the paired upward pointing divisions. Clusters of spores, or sori, are borne on veins just in from the edges on the undersides of the blades. Each sorus is partially contained in a whitish membranous pocket, or indusium.

Phenology
Mature fronds in August.

Diagnostic Characteristics
The blades of C. fragilis are at least twice as long as they are wide. Gymnocarpium dryopteris has a triangular blade, but it is somewhat wider than it is long, and the sorus lacks an indusium. Dryopteris austriaca has blades that are over 20 cm long.

Species Range
Unknown/Undetermined
 


Range Comments
In MT known only from Flathead Co.; WA, MT, QC and disjunct in CO (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Summary of Observations Submitted for Montana
Number of Observations: 2

(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 ledges near or above timberline.

Ecological Systems Associated with this Species

References
  • Additional ReferencesLegend:   View Online Publication
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    • Lellinger, D.B. 1985. A Field Manual of the Ferns and Fern-Allies of the United States and Canada. Smithsonian Inst. Press. Washington, D.C. B85LEL01PAUS
    • Lesica, P., M. T. Lavin, and P. F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
    • McLaughin, W. T. 1935. Notes on the flora of Glacier National Park, Montana. Rhodora 37:362-365.
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Citation for data on this website:
Mountain Bladder Fern — Cystopteris montana.  Montana Field Guide.  .  Retrieved on , from