Margined Streamside Moss
Scientific Name: Scouleria marginata
Taxonomy Group: Mosses
COSEWIC Range: British Columbia
COSEWIC Assessment Date and Status Change: May 2012
COSEWIC Status: Endangered
COSEWIC Status Criteria: D1
COSEWIC Reason for Designation: This large, showy moss occurs just above water’s edge along small montane streams. A rare western North American endemic, it is known in Canada from a single occurrence in southern British Columbia. Although the species has not been found in recent surveys, it may be present in nearby watersheds.
COSEWIC History of Status Designation: Designated Endangered in November 2002. Status re-examined and confirmed in May 2012.
SARA Status: Schedule 1, Endangered
Date of Listing (yyyy-mm-dd): 2005-01-12
Please note that this information is provided for general information purposes only. For the most up to date and accurate list of species listed under the Species at Risk Act, please see the Justice Laws Website.
Image of Margined Streamside Moss
The Margined Streamside Moss is a relatively large, cushion-forming moss that grows in dark green or yellowish-brown to blackish tufts. Its stems are frequently branched and range in length from 6 to 10 cm. The leaves are lance-shaped, 2.5 to 4 mm long, and about 1 mm wide.
Distribution and Population
Globally, the Margined Streamside Moss is restricted to the Pacific Northwest in North America. The only population known to occur in Canada is in the Kootenay region of British Columbia near the border with the United States. There is no information on the population size or trends of the Canadian population. The Margined Streamside Moss has not been found at the site since the original discovery. As the area has been heavily disturbed, it is possible that the species is now extirpated from this location.
Margined Streamside Moss grows on rocks, particularly granite, in streams. It may be exposed or submerged, and is found at a range of elevations. The population found in southern British Columbia was on wet rocks at an elevation of 1300 m. In the United States, it is usually mixed with the more common Scouleria aquatica and requires clean water and cool temperatures.
Little is known about the biology of the Margined Streamside Moss. It is dioicous: the male and female reproductive units are on separate plants — and it apparently does not reproduce vegetatively. The dioicous nature is known to limit the production of spores (the reproductive body from which a new plant arises) in many species of moss. Without spore production, it is impossible for a species to spread. When spores are produced, they are likely dispersed by water or possibly wind. The Margined Streamside Moss is often found with the closely related Scouleria aquatica. The two species apparently have similar habitat requirements, and the Margined Streamside Moss may get out-competed in some areas. This may partially account for the restricted range of the Margined Streamside Moss.
Flooding, cattle usage, and sedimentation threaten the Margined Streamside Moss. In particular, deposits of silt on boulders in the streams interfere with the establishment of the moss.
The Margined Streamside Moss is protected under the federal Species at Risk Act (SARA). More information about SARA, including how it protects individual species, is available in the Species at Risk Act: A Guide.
Provincial and Territorial Protection
Status of Recovery Planning
Recovery Strategies :
Name Recovery Strategy for the Margined Streamside Moss (Scouleria marginata) in Canada
Status Final posting on SAR registry
BC Bryophyte Recovery Team
Brenda Costanzo - Chair/Contact - Government of BC
Phone: 250-387-9611 Fax: 250-356-9145 Send Email
Recovery Progress and Activities
Summary of Progress to Date The draft recovery strategy has been completed. The species was not relocated during an inventory completed during the summer of 2005.
PLEASE NOTE: Not all COSEWIC reports are currently available on the SARA Public Registry. Most of the reports not yet available are status reports for species assessed by COSEWIC prior to May 2002. Other COSEWIC reports not yet available may include those species assessed as Extinct, Data Deficient or Not at Risk. In the meantime, they are available on request from the COSEWIC Secretariat.
11 record(s) found.
- COSEWIC Status Reports (2 record(s) found.)
- Response Statements (2 record(s) found.)
- Recovery Strategies (1 record(s) found.)
- Orders (2 record(s) found.)
- COSEWIC Annual Reports (2 record(s) found.)
- Consultation Documents (2 record(s) found.)
COSEWIC Status Reports
Response Statement - Margined Streamside Moss (2013-01-03)This large, showy moss occurs just above water’s edge along small montane streams. A rare western North American endemic, it is known in Canada from a single occurrence in southern British Columbia. Although the species has not been found in recent surveys, it may be present in nearby watersheds.
Response Statements - Margined Streamside Moss (2004-04-21)A response statement is a communications document that identifies how the Minister of the Environment intends to respond to the assessment of a wildlife species by the Committee on the Status of Endangered Wildlife in Canada (COSEWIC). The document provides a start to the listing and recovery process for those species identified as being at risk, and provides timelines for action to the extent possible.
COSEWIC Annual Reports
COSEWIC Annual Report - 2003 (2003-10-01)May 2003 Annual Report to the Canadian Endangered Species Conservation Council by the Committee on the Status of Endangered Wildlife in Canada.
COSEWIC Annual Report - 2011-2012 (2012-10-05)Under Canada’s Species at Risk Act (SARA), the foremost function of COSEWIC is to “assess the status of each wildlife species considered by COSEWIC to be at risk and, as part of the assessment, identify existing and potential threats to the species”. COSEWIC held two Wildlife Species Assessment Meetings in this reporting year (September 1, 2011 to September 30, 2012) from November 21 to 25, 2011 and from April 29 to May 4, 2012. On February 3, 2012, an Emergency Assessment Subcommittee of COSEWIC also assessed the status of the Tri-colored Bat (Perimyotis subflavus), the Little Brown Myotis (Myotis lucifugus), and the Northern Myotis (Myotis septentrionalis). During the current reporting period COSEWIC assessed the status or reviewed the classification of 67 wildlife species. For species already found on Schedule 1 of SARA, the classification of 32 species was reviewed by COSEWIC and the status of the wildlife species was confirmed to be in the same category (extirpated - no longer found in the wild in Canada but occurring elsewhere, endangered, threatened or of special concern). The wildlife species assessment results for the 2011-2012 reporting period include the following: Extinct: 1 Extirpated: 4 Endangered: 29 Threatened: 10 Special Concern: 15 Data Deficient: 2 Not at Risk: 6 Total: 67 Of the 67 wildlife species examined, COSEWIC reviewed the classification of 49 species that had been previously assessed. The review of classification for 26 of those species resulted in a confirmation of the same status as the previous assessment (see Table 1a).