A Roellobryon Moss - Roellobryon roellii
Roellia roellii [invalid name]
MNPS Threat Rank
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).
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:
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(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).
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
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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.
- Malcolm, B., N. Malcolm, J. Shevock, and D. Norris. 2009. California Mosses. Nelson, New Zealand: Micro-Optics Press. 430 pp.