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Montana Field Guide

Montana Field Guides

Mountain Swordfern - Polystichum scopulinum
Other Names:  Mountain Hollyfern

Species of Concern

Global Rank: G4
State Rank: S1S2
* (see State Rank Reason below)

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

External Links






State Rank Reason (see State Rank above)
Only two known locations from western Montana. Very little data are available for the known occurrences. Additional surveys are needed.
  • Details on Status Ranking and Review
    Mountain Swordfern (Polystichum scopulinum) Conservation Status Review
    Review Date = 11/07/2012
    View State Conservation Rank Criteria
    Population Size

    Score3 - Vey Small: Generally <2,000 individuals.

    CommentEstimated. No population data available.

    Range Extent

    Score1 - Peripheral, Disjunct or Sporadic Distribution in MT: Widespread species that is peripheral, disjunct or sporadically distributed within MT such that it occurs in <5% of the state (<7,500 sq. miles or the combined area of Beaverhead and Ravalli Counties) or is restricted to 4-5 sub-basins.

    Area of Occupancy

    Score3 - Very Low: Generally occurring in 3 or fewer Subwatersheds (6th Code HUC’s).

    Environmental Specificity

    Score1-2 - Moderate to High.

    Trends

    Score0-3 - Population trends are unknown.

    Threats

    Score1-2 - Medium to High.

    CommentThough no specific threats have been identified, known occurrences are near trails and a riverbank providing the opportunity for negative impacts.

    Intrinsic Vulnerability

    Score1-2 - Moderate to High Vulnerability.

    Raw Conservation Status Score

    Score 10 to 16 total points scored out of a possible 19.

 
General Description
Mountain Holly-fern has evergreen fronds that are 10-40 cm long, and clustered on a short, stout, scaly rhizome. The blades are made up of 20-40 primary pinnae on each side of the rachis. The primary pinnae are 1.5-3.2 mm long, and pinnately lobed with large basal lobes. Above the basal lobes, the pinnae are 1/3 to 1/2 as wide as long, and the lobes become progressively more shallow-cut and tooth-like. The lobes or teeth are inconspicuously sharp-tipped, and the apical tooth is larger than those nearest it. Circular clusters of sporangia borne on the undersides of the middle and upper
pinnae are covered by indusia.

Phenology
Producing spores in June; evergreen and identifiable in all seasons.

Diagnostic Characteristics
The species is most similar to P. kruckebergii, both distinguished from other Montana hollyferns by having pinnae with large basal lobes. The latter differs in having shorter pinnae mostly 0.5-1.5 mm long that are 1/2 to as wide as long, with lobes or teeth that end in minute tips, and the apical tooth is not much larger than those nearest it.

Species Range
Present
 


Range Comments
In MT known from Ravalli and Sanders counties; BC to MT south to CA and AZ, disjunct in QC and NL (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 crevices in subalpine zone, and moist rocks along rivers in the valleys.

References
  • Additional ReferencesLegend:   View Online Publication
    Do you know of a citation we're missing?
    • Lackschewitz, K. H. 1976. Montana mountain flora: new records. Madrono 23:360-362.
    • Lackschewitz, K., P. Lesica and J. S. Shelly. 1988. Noteworthy collections: Montana. Madrono 35:355-358.
    • 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.
  • Web Search Engines for Articles on "Mountain Swordfern"
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Citation for data on this website:
Mountain Swordfern — Polystichum scopulinum.  Montana Field Guide.  .  Retrieved on , from