BC Conservation Data Centre: Species Summary
Trematodon asanoi
| Scientific Name: | Trematodon asanoi Tuzibe | ||||||||||
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| Scientific Name Synonyms: |
Trematodon boasii
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| English Name: | |||||||||||
| Classification / Taxonomy | |||||||||||
| Scientific Name - Concept Reference: | Iwatsuki, Z. and T. Suzuki. 2006. A taxonomic revision of Trematodon asanoi and its related species (Dicranaceae, Musci). Journal of the Hattori Botanical Laboratory 99: 259-269. | ||||||||||
| Classification Level: | Species | ||||||||||
| Species Group: | Bryophyte | ||||||||||
| Species Code: | TREMASA | ||||||||||
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| Conservation Status / Legal Designation | |||||||||||
| Global Status: | G3? (Apr 2021) | ||||||||||
| Provincial Status: | S2S3 (Apr 2024) | ||||||||||
| BC List: | Blue | ||||||||||
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| General Description: | |||||||||||
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| Diagnostic Characteristics: | Trematodon asanoi is a tiny moss with small capsules subtended by a long, tapering neck. The peristome teeth are undivided (Exeter et al. 2016), and it grows on moist soil in subalpine areas (Christy 2007). | ||||||||||
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| Habitats: (Type / Subtype / Dependence) |
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| Global Habitat Comments: | "Forming loose mats on moist bare soil along the edges of trails, streams and ponds in the subalpine zone. Soils usually have some organic content and are irrigated by meltwater from late-season snowbeds. Little is known about associated species. Habitats probably include Phyllodoce empetriformis and Cassiope mertensiana heath and Tsuga mertensiana, Abies lasiocarpa, and Abies amabilis forest associations" (Christy 2007). | ||||||||||
| Provincial Phenology: (1st half of month/ 2nd half of month) |
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| Elevation (m) (min / max): | Provincial: | ||||||||||
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| Dispersal: | |||||||||||
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| Distribution | |||||||||||
| Endemic: | N | ||||||||||
| Global Range Comment: | Trematodon asanoi is known from the Pacific Northwest of North America, and from Japan. In Canada, it has been documented in British Columbia on the Queen Charlotte Islands, on Vancouver Island and at a nearby mainland site. It has been documented from the Central Cascades of Oregon. One immature specimen from the Sierra Nevada of California was previously attributed to this taxon (Norris and Shevock 2004), but that determination has since been revised, and this moss is currently not considered known from California (J. Shevock pers. comm 2009). The Bryophyte Flora of North America treatment (Zander 2007) also reports it from Newfoundland; however, that report is in error, as the taxon in Newfoundland is T. montanus rather than this species (R. Belland, pers. comm. 2010). The recent merger of T. boasii and T. asanoi material (Iwatsuki and Suzuki 2006) means that this broader T. asanoi is also known from Japan, suggesting a "North Pacific" distribution for the broader taxon. It is not known from Korea (Kim et al. 2020) or the Russian Far East (Cherdantseva et al. 2018). | ||||||||||
| Disjunct, more common elsewhere: | N | ||||||||||
| Peripheral, major distribution elsewhere: | N | ||||||||||
| Authors / Contributors | |||||||||||
| Global Information Author: | Nordman, C. (2021). | ||||||||||
| Last Updated: | Apr 15, 2021 | ||||||||||
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| References and Related Literature | |||||||||||
Christy, J. A. 2007 last update. Species Fact Sheet: Trematodon asanoi. Interagency Special Status/Sensitive Species Program (ISSSSP) Conservation Planning Documents, U.S. Forest Service (Pacific Northwest Regional Office) and Bureau of Land Management (Oregon/Washington State Office). Online. Available: http://www.fs.fed.us/r6/sfpnw/issssp/planning-documents/species-guides.shtml (Accessed 2009). |
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Christy, J. A. 2007. Species Fact Sheet: Trematodon asanoi. Interagency Special Status/Sensitive Species Program (ISSSSP) Conservation Planning Documents, U.S. Forest Service (Pacific Northwest Regional Office) and Bureau of Land Management (Oregon/Washington State Office). |
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Iwatsuki, Z., and T. Suzuki. 2006. A taxonomic revision of Trematodon asanoi and its related species (Dicranaceae, Musci). Journal of the Hattori Botanical Laboratory 99: 259-269. |
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Lawton, E. 1971. Moss flora of the Pacific Northwest. The Hattori Botanical Laboratory, Japan. 362 pp. |
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Ryan, M.W. 1996. Bryophytes of British Columbia: rare species and priorities for inventory. Res. Br., B.C. Min. For., and Wildl. Br., B.C. Min. Environ., Lands and Parks. Victoria, B.C. Work. Pap. 12/1996. |
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Schofield, W.B. 1966. A new species of TREMATODON from western North America. Bryologist 66:202-204. |
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Schofield, W.B. 1984. Bryogeography of the Pacific coast of North America. Journal of the Hattori Botanical Laboratory 55: 35-43. |
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Zander, R.H. 2007b. Bruchiaceae. Pp. 433-439 In: Flora of North America Editorial Committee (eds.). Flora of North America, North of Mexico, Volume 27: Bryophyta, part 1. Oxford University Press, New York. 713 pp. |
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Please visit the website Conservation Status Ranks for definitions of the data fields used in this summary report.
Suggested Citation:
B.C. Conservation Data Centre. 2021. Species Summary: Trematodon asanoi. B.C. Minist. of Environment. Available: https://a100.gov.bc.ca/pub/eswp/ (accessed Jun 4, 2026).