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Olympic Dichodontium Moss - Dichodontium olympicum
Other Names:  Olympic Fork Moss

Species of Concern
Native Species

Global Rank: G3G5
State Rank: S1

Agency Status
MNPS Threat Rank:

External Links

General Description
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).

Diagnostic Characteristics
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).

Range Comments
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).

Wet soil and soil over rock (Elliott 2016), a montane species, often linked with snowmelt (FNA 2007).

Reproductive Characteristics
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). December 20th. 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
    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.
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Citation for data on this website:
Olympic Dichodontium Moss — Dichodontium olympicum.  Montana Field Guide.  .  Retrieved on , from