Olympic Dichodontium Moss - Dichodontium olympicum
Olympic Fork Moss
Plants: Acrocarpous, green, in loose tufts (Lawton 1971). Stems 40-80 mm (FNA 2007).
Leaves: Contorted when dry, spreading when wet (Lawton 1971), the distal end concave, 1-2.2 mm (FNA 2007), narrowly or widely ovate-lanceolate or somewhat lingulate (tongue-shaped) (Lawton 1971), apex widely acute to narrowly rounded-obtuse, sometimes abruptly squared off (FNA 2007); margins entire or frequently finely-waved/denticulate from protruding cell ends (Lawton 1971), usually flat proximally, seldom recurved, quite papillose near attachment and apex but not toothed (FNA 2007).
Leaf Cells: Median laminal cells bearing papillae, sometimes forked, on both faces; costa cells of outer surface quadrate or more rectangular (1-2:1), papillose, resembling the nearby laminal cells (FNA 2007).
Capsules ripen in July-October (FNA 2007).
Dichodontium olympicum and D. pellucidum closely resemble one another. The denticulations on the margins of D. olympicum are even; in D. pellucidum, occasional teeth pointing toward the apex interrupt the denticulations (FNA 2007).
Canada: AB, BC; USA: CA, ID, MT, WA (FNA 2007). In Montana: Flathead and Lincoln Counties (Elliott 2016). Type locality from Olympic Mts, Washington (Grout 1928).
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)
Wet soil and soil over rock (Elliott 2016), a montane species, often linked with snowmelt (FNA 2007).
Autoicous (FNA 2007). Seta 4-8 mm. Capsule: 1-1.4 mm, with swelling at base (strumose) (FNA 2007); operculum almost as long as the urn (Lawton 1971).
- 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.
- Grout, A.J. 1928-1940. Moss Flora of North America, North of Mexico. Published by the author, Newfane, Vermont. 3 volumes.
- 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.