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Montana Field Guides

An Amblyodon Moss - Amblyodon dealbatus

Potential Species of Concern
Native Species

Global Rank: G3G5
State Rank: SNR
(see State Rank Reason below)

Agency Status


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State Rank Reason (see State Rank above)
Amblyodon dealbatus has been found in two counties of Montana. Several collections made in the 1890s by R.S. Williams have been assigned to Flathead County. A 2017 collection by J. Elliott was found in Cascade County.
General Description
Plants: Acrocarpous, the tufts not crowded, 10(-25) mm (FNA 2014), light green, the stems erect and frequently branched (Lawton 1971).

Leaves: Crowded near top of stem, upright-spreading when wet, somewhat erect to slightly contorted when dry, 2-4 mm, ovate-lanceolate; apex abruptly acute to acuminate; margins plane, smooth or nearly so (FNA 2014) with upper leaves sometimes toothed towards apex (Lawton 1971); costa broad, not approaching apex closely (FNA 2014).

Leaf Cells: Laminal cells translucent, lax, oblong and rhombic to 6-sided, with thin walls and a smooth surface; distal cells similar in size to basal cells (FNA 2014).

Diagnostic Characteristics
Amblyodon dealbatus differs from Meesia species by its thin-walled and lax (swollen when wet, crumpling while drying out) laminal cells (FNA 2014).

Range Comments
Canada: AB, BC, MB, NL, NT, NU, ON, QC, YT; USA: AK, CO, MI, MN, MT, WI, WY; Europe; Asia (FNA 2014). In Montana: Flathead County (Elliott 2016).

Observations in Montana Natural Heritage Program Database
Number of Observations: 6

(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)

Rotten wood and organic soil of fens in the boreal zone (Elliott 2016); low to high elevations (FNA 2014).

Reproductive Characteristics
Autoicous (FNA 2014). Seta 12-40 mm. Capsule 2-3 mm (FNA 2014), smooth, brown, pear-shaped with a long neck (Lawton 1971); exostome teeth 16; endostome with 16 parts, longer than exostome (FNA 2014).

  • Literature Cited AboveLegend:   View Online Publication
    • Elliott, J.C. and A.K. Pipp. 2018. A Checklist of Montana Mosses (1880-2018). Updated 3 January, 2020. Montana Natural Heritage Program, Helena, Montana. 73 pp.
    • Flora of North America Editorial Committee, eds. 2014. Flora of North America North of Mexico. Volume 28. Bryophytes: Mosses, Part 2. Oxford University Press, Inc., NY. xxi + 702 pp.
    • Lawton, E. 1971. Moss Flora of the Pacific Northwest. Hattori Botanical Laboratory. Japan: Yamabuki-cho, Shinjuku-ku, Tokyo. 362 pages plus appendices.
  • Additional ReferencesLegend:   View Online Publication
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    • Elliot, J. C. 1993. Second checklist of Montana mosses. Unpublished report. U.S. Forest Service, Region 1. Missoula, MT. 45 pp.
    • 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.
    • Malcolm, W. M., and Nancy Malcolm. 2000. Mosses and Other Bryophytes: An Illustrated Glossary. Nelson, New Zealand: Micro-Optics Press.
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Citation for data on this website:
An Amblyodon Moss — Amblyodon dealbatus.  Montana Field Guide.  .  Retrieved on , from