Mountain Swordfern - Polystichum scopulinum
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
Score3 - Vey Small: Generally <2,000 individuals.
CommentEstimated. No population data available.
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).
Score1-2 - Moderate to High.
Score0-3 - Population trends are unknown.
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.
Score1-2 - Moderate to High Vulnerability.
Raw Conservation Status Score
10 to 16 total points scored out of a possible 19.
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 cm 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.
Producing spores in June; evergreen and identifiable in all seasons.
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 cm 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.
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).
Observations in Montana Natural Heritage Program Database
Number of Observations:
(Click on the following maps and charts to see full sized version)
Map Help and Descriptions
(Observations spanning multiple months or years are excluded from time charts)
Moist rock crevices in subalpine zone, and moist rocks along rivers in the valleys.
- 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.