Search Field Guide
Advanced Search
MT Gov Logo
Montana Field Guide

Montana Field Guides

A Roellobryon Moss - Roellobryon roellii
Other Names:  Roellia roellii [invalid name]

Native Species

Global Rank: G4
State Rank: SNR

Agency Status
MNPS Threat Rank:

External Links

General Description
Plants: Acrocarpous. Growing in large, open patches or as well-spaced, upright individuals (FNA 2014), frequently shiny (Lawton 1971), typically light green, sometimes tinged with pale red below. Stems 10-40 mm tall, not forked; rhizoids restricted to the base, scarce (FNA 2014).

Leaves: Leaves larger and dense above and forming rosettes, becoming scalelike below,
overlapping or a little bent and twisted when dry, spreading to about 45 degrees when wet (FNA 2014); scalelike leaves small and egg-shaped (Lawton 1971); leaves of the rosette 4-6 mm in length, widely egg-shaped, sometimes with the broader part closer to the distal end, narrowing above to the acute leaf tip, sometimes forming a mucro, the base extending down the stem, the edges flat and saw-toothed (seldom smooth) above, rolled back and under below, with a strong border, and the costa reaching the leaf tip (FNA 2014).

Leaf Cells: Lower laminal cells long and quadrangular; middle and upper laminal cells shorter than those below, typically diamond-shaped to 6-sided, their longer dimension not transverse to the leaf length, fine-walled; margins 1 cell-layer thick, the thick-walled cells forming a border of 1-2 series; costa in X-section with dorsal stereid band weak to very faint (FNA 2014).

Fruit ripens mid- to late-summer (FNA 2014).

Species Range

Range Comments
Endemic to the US and Canada. AK, BC and AB, s to CA, NV, UT and CO (FNA 2014). Known in Montana from Cascade, Fergus, Flathead, Gallatin, Glacier, Lake, Lincoln, Lewis and Clark, Prairie, Missoula, and Ravalli Counties (Elliott & Pipp, 2016).

Observations in Montana Natural Heritage Program Database
Number of Observations: 59

(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)

Shrub and tree detritus and humus in evergreen forests. Elevation: 0-10,500 feet (FNA 2014).

Reproductive Characteristics
Dioicous. Sporophytes seldom produced. Antheridia yellow, numerous. Perichaetial bracts rosulate, the interior ones more slender and with costa not as strong (FNA 2014). Seta 3-5 cm tall (Lawton 1971), yellow, turning russet eventually, usually solitary, occasionally 2 in a perichaetium, straight, bearing the capsule well beyond the bracts. Capsule brown, drooping, elongate, 4-7 mm in length, sometimes bowed a little, with a distinct neck; exostome teeth with a slender border, papillae, and transverse cross bars; endostome processes with openings on the keel; cilia knobby (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
    Do you know of a citation we're missing?
    • 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, B., N. Malcolm, J. Shevock, and D. Norris. 2009. California Mosses. Nelson, New Zealand: Micro-Optics Press. 430 pp.
  • Web Search Engines for Articles on "A Roellobryon Moss"
Login Logout
Citation for data on this website:
A Roellobryon Moss — Roellobryon roellii.  Montana Field Guide.  .  Retrieved on , from