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Montana Field Guides

A Bryum Moss - Imbribryum gemmiparum
Other Names:  Bryum gemmiparum

Native Species

Global Rank: G3G5
State Rank: SNR

Agency Status
MNPS Threat Rank:

External Links

General Description
Plants: Acrocarpous (Vitt 1988). Growing in upright clumps, sometimes shiny, brilliant- to yellow-green, becoming straw-colored with time. Stems usually 1-2 cm tall (FNA 2014), occasionally forking below the apex (Lawton 1971), occasionally thickly covered with brown rhizoids when old (FNA 2014).

Leaves: Green, or occasionally yellow-tinged when young, soft and somewhat loosely arranged (FNA 2014), hardly contorted when dry, upright and spreading a little when hydrated (Crum & Anderson et al. 1981), 1-3 mm in length (FNA 2014), 0.5-0.7 mm in width (Lawton 1971), lance-shaped (Crum & Anderson et al. 1981) to egg-shaped and deeply cupped; margins smooth (FNA 2014), typically flat above (Lawton 1971), sometimes a little rolled back and downward below (mostly when dry) (Crum & Anderson et al. 1981), borderless; base extending down the stem only slightly (FNA 2014); leaf tip acute or somewhat obtuse (Lawton 1971); costa extending to or a little shy of the leaf tip, brown or sometimes tinged with yellow (FNA 2014).

Leaf Cells: Basal cell row uncolored, the transition to proximal laminal cells sudden; proximal cells short-quadrangular, the area occasionally sprinkled with square cells; upper and middle cells fine-walled, 6-sided (FNA 2014) to rhomboidal (Crum & Anderson et al. 1981) and elongated in line with the costa; margins of 1 cell layer (FNA 2014).

Fruit ripens springtime to summertime (FNA 2014).

Range Comments
North American Range

AK, BC and AB, s to CA, AZ and NM, ND, SD, OK, MN, MI, MO, PA ne to ME (FNA 2014). Known in Montana from Flathead County (Elliott 2016).

Calcareous soil or soil-covered rock in moist to wet conditions (FNA 2014), such as along stream banks, around springs, on seepage areas of bluffs (Crum & Anderson et al. 1981). Elevation: 0-5910 feet (FNA 2014).

Reproductive Characteristics
Dioicous. Sporophytes rare (FNA 2014). Seta 1-2 cm tall, russet (Lawton 1971). Capsule brown, pear-shaped, 2-3 mm in length, somewhat ascending to drooping; peristome double; cilia long and transversely ridged (FNA 2014).

Specialized vegetative reproduction by tubers growing on axillary rhizoids from the leaves, the tubers pinkish; seldom occurring. Although this form of reproduction has been observed for this species in Europe, it has not been verified in North American plants (FNA 2014).

  • Literature Cited AboveLegend:   View Online Publication
    • Crum, H.A. and L.E. Anderson. 1981. Mosses of Eastern North America. 2 volumes. Columbia University Press, New York. 1328 pp.
    • 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. 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.
    • Vitt, D. J. Marsh, and R. Bovey. 1988. Mosses, Lichens & Ferns of Northwest North America. Seattle, WA: University of Washington Press. 296 p.
  • Additional ReferencesLegend:   View Online Publication
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    • Flowers, S. 1973. Mosses: Utah and the West. Brigham Young University, Provo, Utah. 567 p.
    • 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.
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Citation for data on this website:
A Bryum Moss — Imbribryum gemmiparum.  Montana Field Guide.  .  Retrieved on , from