A Oligotrichum Moss - Oligotrichum aligerum
Plants: Acrocarpous (Vitt 1981). Growing in upright clumps with shoots laxly-spaced or somewhat closer to each other, pale, olivaceous. Stems 20-30 mm in height, thin, unbranched or seldom branching from just beneath terminal reproductive organs (FNA 2007).
Leaves: Upright and near to the stem when dry, spreading more or less when damp, 3-5 mm in length, lance-shaped with ovate tendencies, the base partially enveloping the stem, grooved above, lamellate on both leaf faces; margins unbordered, somewhat sharply bent back and curved under narrowly (FNA 2007), or upright and curved inward a little (Lawton 1971), saw-toothed except for the proximal 1/4; costa extending to the apex and terminating in a short point (FNA 2007).
Leaf Cells: Dorsal lamellae robust and arising from the outer surface of the costa as well as 3-4 projecting from the lamina on each side of the costa, with a height of 1-3 cells, in profile the top (margin) of each lamella appearing saw-toothed; ventral lamellae 5-7 (FNA 2007) or as many as 12 (Lawton 1971), all arising from the costa, with a height of 5-9 cells, the margin appearing undulate to saw-toothed; laminae wide, 1 cell-layer thick, proximal cells short and quadrangular; medial laminal cells square with the angles curved, arranged in even, lengthwise series (FNA 2007).
Canada: BC; USA: WA and OR, e to MT; Mexico (FNA 2007). Known in Montana from Lincoln County (Elliott & Pipp, 2016).
Observations in Montana Natural Heritage Program Database
Number of Observations:
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Humus and damp soil with clayey or sandy texture, on roadside slopes, and exposed roots from upended trees in areas influenced by a Pacific maritime climate (FNA 2007). Low and somewhat higher elevations, seldom reaching 4920 feet (Lawton 1971).
Dioicous. Perigonial bracts widely egg-shaped and somewhat triangular, forming a prominent rosette; perichaetial bracts larger than the foliage leaves. Seta usually single, yellow with red tones, 30-40 mm in height, smooth, spiraled above when dry. Capsule 4-5 mm long, sometimes with 4 or more lengthwise crests (FNA 2007), slightly constricted below the opening when dry (Lawton 1971); the neck with a plethora of stomata; peristome double, the 32 teeth lightly-colored (FNA 2007) and with tiny papillae (Lawton 1971). Calyptra with few hairs (FNA 2007).
- 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. 2007. Flora of North America North of Mexico. Volume 27. Bryophytes: Mosses, Part 1. Oxford University Press, Inc., NY. xxi + 713 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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- 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.