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Montana Field Guides

Limestone Maidenhair Spleenwort - Asplenium trichomanes-ramosum
Other Names:  Asplenium viride

Species of Concern
Native Species

Global Rank: G5
State Rank: S3
(see State Rank Reason below)
State Threat Score: No Known Threats
CCVI: Moderately Vulnerable

Agency Status


External Links

State Rank Reason (see State Rank above)
S3 SOC: Asplenium trichomanes-ramosum plants are never common, grow in habitat that is limited in Montana, and occur where land management (example: national park, wilderness) provides some protections.
  • Details on Status Ranking and Review
    Limestone Maidenhair Spleenwort (Asplenium trichomanes-ramosum) Conservation Status Review
    Review Date = 11/14/2016
    View State Conservation Rank Criteria
    Population Size

    ScoreC - 250 - 1,000 individuals

    Range Extent

    ScoreF - 20,000-200,000 sq km (~8,000-80,000 sq mi)

    Area of Occupancy

    ScoreD - 6-25 4-km2 grid cells

    Number of Populations

    ScoreC - 21 - 80

    Number of Occurrences or Percent Area with Good Viability / Ecological Integrity

    ScoreC - Few (4-12) occurrences with excellent or good viability or ecological integrity

    Environmental Specificity

    ScoreB - Narrow. Specialist or community with key requirements common

    Long-term Trend

    ScoreU - Unknown


    ScoreU - Unknown


    ScoreD - Low

    CommentNo known threats. Many locations occur in NPS and Wilderness where threats likely don't exist or are very low.

    Intrinsic Vulnerability

    ScoreU - Unknown

General Description
Plants: Semi-evergreen perennials from short, creeping, scaled rhizomes (McGregor et al. 1986) with few roots (FNA 1993); scales dark, 1-3 mm in length, lanceolate (McGregor 1986).

Leaves: Leaves frequently branched, ascending (FNA 1993), spreading, clustered (McGregor 1986), 4–15 cm long, with 6-20 pairs of pinnae (Lesica 2012); blades arching, once-pinnate, 1.5-12 cm in length, 0.5-1.3 cm in width; petioles slender and wiry, 0.3-4 cm in length, chestnut-colored proximally, becoming green, smooth or with sparse, glandular brown hairs; rachis green; pinnae nearly opposite to alternate, 2-6 mm in length, obovate, short-stalked or nearly sessile, with toothed margins (McGregor et al. 1986) or distal margins crenate (FNA 1993)

(P. Lesica's contribution adapted from Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX)

June-September (McGregor et al. 1986).

Species Range
Montana Range Range Descriptions


Range Comments
Circumboreal, extending south in scattered localities (Lesica 2012), including Greenland; AB, BC, NB, NL, NT, NS, ON, PE, QC, YT; AK, CA, CO, ID, ME, MI, MT, NV, NY, OR, SD, UT, VT, WA, WI, WY (FNA 1993). Known in Montana from some northwestern counties and is disjunct in Fergus County (Lesica 2012).

(Lesica's contribution adapted from Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX)

Observations in Montana Natural Heritage Program Database
Number of Observations: 29

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
Relative Density



(Observations spanning multiple months or years are excluded from time charts)

Shaded basic rocks (FNA 1993), including moist to wet limestone crevices; montane to alpine (Lesica 2012).

(Lesica's contribution adapted from Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX)
Predicted Suitable Habitat Model

This species has a Predicted Suitable Habitat Model available.

To learn how these Models were created see

Reproductive Characteristics
Sori: Sori 4 to 8 per pinna (Lesica 2012), blending into each other with age, median, elliptic (McGregor 1986), narrow, 2-3 mm in length (Douglas et al. 2000); the indusia connected to the upper side of the pinna’s veinlet (McGregor et al. 1986).

(P. Lesica's contribution adapted from Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX)

Threats or Limiting Factors
Threat impact not assigned because threats are not known (MTNHP Threat Assessment 2021).

  • Literature Cited AboveLegend:   View Online Publication
    • Douglas, G.W., D. Meidinger, and J. Pojar, editors. 2000. The Illustrated Flora of British Columbia. Volume 5. Dicotyledons (Salicaceae through Zygophyllaceae) and Pteridophytes. British Columbia Ministry of Environment, Lands and Parks and British Columbia Ministry of Forests, Victoria.
    • Flora of North America Editorial Committee, eds. 1993. Flora of North America North of Mexico. Volume 2. Pteridophytes and Gymnosperms. Oxford University Press, Inc., NY. xvi + 475 pp.
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
    • McGregor, R.L. (coordinator), T.M. Barkley, R.E. Brooks, and E.K. Schofield (eds). 1986. Flora of the Great Plains: Great Plains Flora Association. Lawrence, KS: Univ. Press Kansas. 1392 pp.
  • Additional ReferencesLegend:   View Online Publication
    Do you know of a citation we're missing?
    • Britton, N. L. and A. B. Brown. 1913. An Illustrated Flora of the Northern United States, Canada, and the British Possessions. 2nd Edition in 3 Volumes. New York, NY: Charles Scribner's Sons. B13BRI01PAUS.
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2022. Manual of Montana Vascular Plants, Second Edition. Fort Worth, TX: BRIT Press. viii + 779 p.
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Citation for data on this website:
Limestone Maidenhair Spleenwort — Asplenium trichomanes-ramosum.  Montana Field Guide.  .  Retrieved on , from