A Dry Rock Moss - Grimmia anodon
A Black Rock Moss
MNPS Threat Rank
Plants: Small cushions. Dark green to brown. Stems 0.5-1.0 cm tall.
Leaves: Oblong-ovate to oblong-lanceolate, 0.9-2.0 x 0.4-0.8 mm, concave, and keeled. Awn 0.1-1.2 mm long. Both margins plane. Costa reaches apex.
Leaf Cells: Basal laminal cells near costa and near margin are quadrate to long-rectangular, straight, thin-walled. Median laminal cells are quadrate, sinuose, and thick-walled. X-S: distal laminal cells are 1-layered with patches of 2-layers; distal marginal cells are 2-layered.
Without capsules it is harder to identify. It can be confused with G. plagiopodia and Schistidium flaccidum. G. plagiopodia generally inhabits meadow-like sites and at lower elevations compared to G. anodon. G. plagiopodia’s sigmoid seta topped by a peristomatic capsule with perforated full teeth helps in its recognition. G. anodon lacks a peristome and has an annulus. The leaves of G. plagiopoda are 2-stratose and more concave then G. anodon’s mostly 1-stratose, more keeled leaves. The leaf margins of Schistidium flaccidum are revolute toward the apex (FNA 2007).
Greenland; Canada: AB, BC, NB, NT, NU, ON, QC, SK, YT; United States: AK, AZ, CA, CO, ID, MI, MT, NV, NM, NY, ND, OR, SD, UT, WA, WY; ne Mexico; South America (Bolivia, Chile); Eurasia; Africa (Morocco) (FNA 2007). In Montana, known from Clark, Meagher, Missoula, Park, Ravalli, Rosebud, and Sweet Grass Counties (Elliott 2016).
Observations in Montana Natural Heritage Program Database
Number of Observations:
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Exposed calcareous sandstone, limestone, and concrete. Low to high elevations (65 – 8900 feet). Higher latitude sites are strongly correlated with glacial refugia.
Seta is 0.2-0.3 mm tall, curved, and asymmetrically attached to capsule base. Capsules are often found, lack teeth, immersed, smooth, and swollen on base. Base of capsule with 3-4, large stomata. Autoicous.
Gemmae absent on leaves.
- Literature Cited AboveLegend: View Online Publication
- Elliott, J.C. and A.K. Pipp. 2018. A Checklist of Montana Mosses (1880-2018). December 20th. 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.
- 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.