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A Dry Rock Moss - Grimmia montana
Other Names:  A Black Rock Moss

Native Species

Global Rank: G5?
State Rank: SNR

Agency Status
MNPS Threat Rank:

External Links

General Description
Plant: Hoary cushions, yellow-green to dark blue-green (occasionally almost black). Stems 1.0-1.5 cm tall. X-S of stem with a weak central strand.

Leaf: Narrowly lanceolate, occasionally ovate-lanceolate, 1-2 x 0.3-0.6 mm, concave-keeled, and not plicate. Awn 0.2-1.3 mm long. Margins plane becoming incurved distally. Costa reaches apex.

Leaf Cells: Basal laminal cells near costa short to long-rectangular, straight, thick-walled. Basal laminal cells near margin quadrate to short-rectangular, straight, thick-walled, and not hyaline. Median laminal cells rounded, thick-walled. X-S: distal laminal cells and marginal cells are 2-layered; cells do not bulge. Costa X-S: semi-circular in outline (keeled).

Range Comments
British Columbia to California, Montana to Arizona; Greenland; Europe (Flowers 1973). Greenland; Canada: AB, BC, NU, ON, YT; USA: AK, AZ, CA, CO, ID, MT, NV, NM, OR, UT, WA, WY; Mexico; Europe; Africa (FNA 2007). In Montana: Carbon, Flathead, Glacier, Granite, Lake, Madison, Mineral, Missoula, Ravalli, and Sanders Counties (Elliott 2016).

Exposed acidic granite and sandstone. Moderate to high elevations (2,900-13,200 feet). In the interior west of North America it is common on acidic rock in warm, dry areas.

Reproductive Characteristics
Dioicous. Seta is 2-3 mm tall, straight, and centrally attached to capsule. Capsules are occasionally found, exserted, yellow to brown, oblong-ovate. Stomata absent on capsule.

Gemmae absent on leaves.

  • Literature Cited AboveLegend:   View Online Publication
    • Elliot, J.C., and A.K. Pipp. 2018. A Checklist of Montana Mosses (1880-2018). December 5. Montana Natural Heritage Program, Helena, Montana. 73 pp.
    • Flora of North America Editorial Committee, eds. 2007. Flora of North America North of Mexico. Volume 27. Bryophytes: Mosses, Part 1. Oxford University Press, Inc., NY. xxi + 713 pp.
    • Flowers, S. 1973. Mosses: Utah and the West. Brigham Young University, Provo, Utah. 567 p.
  • Additional ReferencesLegend:   View Online Publication
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    • Lawton, E. 1971. Keys for the Identification of the Mosses on the Pacific Northwest. Reprinted from 'Moss Flora of the Pacific Northwest'. Published as Supplement No. 2 of the Journal of the Hattori Botanical Laboratory. Nichinan, Miyazaki, Japan. 66 pp.
    • Lawton, E. 1971. Moss Flora of the Pacific Northwest. Hattori Botanical Laboratory. Japan: Yamabuki-cho, Shinjuku-ku, Tokyo. 362 pages plus appendices.
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Citation for data on this website:
A Dry Rock Moss — Grimmia montana.  Montana Field Guide.  .  Retrieved on , from