Species Profile

Alkaline Wing-nerved Moss

Scientific Name: Pterygoneurum kozlovii
Taxonomy Group: Mosses
Range: British Columbia, Saskatchewan
Last COSEWIC Assessment: November 2004
Last COSEWIC Designation: Threatened
SARA Status: Schedule 1, Threatened

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Quick Links: | Taxonomy | Description | Distribution and Population | Habitat | Biology | Threats | Protection | Recovery Initiatives | Recovery Team | National Recovery Program | Documents

Image of Alkaline Wing-nerved Moss


There are four Pterygoneurum species in Canada: P. kozlovii, P. lamellatum, P. ovatum and P. subsessile. The main feature that differentiates the Alkaline Wing-nerved Moss from the three other species is the fact that its mature capsules are immersed and lack a lid to allow the release of spores. (Updated 2008/05/20)



Pterygoneurum kozlovii is one of four species of Pterygoneurum in North America. It is a rather inconspicuous moss that forms small to medium sized patches on soil along alkaline wetlands in dry environments. Its most distinctive features are the small flaps that are found on the upper mid-ribs of the leaves and the immersed spore sacs that do not have a lid for spore release. (Updated 2017/05/25)


Distribution and Population

Globally, this moss is found in western North America, Europe, and western Asia. In Canada, it has been found in Saskatchewan and British Columbia. It is relatively widespread, but relatively uncommon, in south-central British Columbia. (Updated 2017/05/25)



This species is restricted to seasonally wet, alkaline soils in open, and dry areas of British Columbia. Eight of the known sites are undisturbed to relatively undisturbed, and eight are moderately to heavily disturbed. Most of the extant populations appear to be on provincially owned lands, in particular Crown lands, although ownership needs to be confirmed for some sites. (Updated 2017/05/25)



Pterygoneurum kozlovii is a small, acrocarpous moss that usually grows in small to medium sized patches or turfs along the edges of seasonally wet, alkaline areas. Sporophytes and spores are common in Canadian populations, and are probably important in maintaining local populations. (Updated 2017/05/25)



Impacts of grazing animals, urban development, road building, and human use of the habitat appear to be the main limiting factors and threats to Pterygoneurum kozlovii. Recent drought may also be a limiting factor. (Updated 2017/05/25)



Federal Protection

The Alkaline Wing-nerved 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

To know if this species is protected by provincial or territorial laws, consult the provinces' and territories' websites.


Recovery Initiatives

Status of Recovery Planning

Recovery Strategies :

Name Recovery Strategy for the Alkaline Wing-nerved Moss (Pterygoneurum kozlovii Laz.) in BC
Status Recovery team/planner in place


Recovery Team

BC Bryophyte Recovery Team

  • Brenda Costanzo - Chair/Contact - Government of BC
    Phone: 250-387-9611  Fax: 250-356-9145  Send Email



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.

8 record(s) found.

COSEWIC Status Reports

COSEWIC Assessments

Response Statements

  • Response Statements - Alkaline Wing-nerved Moss (2005)

    This species, restricted in North America to western Canada, is globally imperiled or rare. Canada possesses the great majority of documented locations. The species typically grows on soil among grasses and sedges along the margins of alkaline ponds and sloughs in semi-arid regions of Canada. It has been confirmed at only 13 sites from 24 reported in south central British Columbia. There is one unconfirmed site in Saskatchewan. About half of all the known sites are subject to impacts from people and domestic animals. Of the British Columbia sites, 6 have apparently been lost to urban development, highway improvement, and trampling by cattle, implying that decline in habitat quality and extent are presently impacting the species.


COSEWIC Annual Reports

  • COSEWIC Annual Report - 2005 (2005)

    2005 Annual Report to the Canadian Endangered Species Conservation Council (CESCC) from the Committee on the Status of Endangered Wildlife in Canada.

Consultation Documents

  • Consultation on Amending the List of Species Under the Species At Risk Act: November 2005 (2005)

    The Government of Canada proclaimed the Species at Risk Act (SARA) on June 5, 2003 as part of its strategy for the protection of wildlife species at risk. Attached to the Act is Schedule 1, the list of the species that receive protection under SARA, hereinafter referred to as the 'SARA list'. Canadians are invited to comment on whether all or some of the species included in this document should be added to the SARA list.

Recovery Document Posting Plans

  • Environment and Climate Change Canada's Three-Year Recovery Document Posting Plan (2016)

    Environment and Climate Change Canada’s Three-Year Recovery Document Posting Plan identifies the species for which recovery documents will be posted each fiscal year starting in 2014-2015. Posting this three year plan on the Species at Risk Public Registry is intended to provide transparency to partners, stakeholders, and the public about Environment and Climate Change Canada’s plan to develop and post these proposed recovery strategies and management plans. However, both the number of documents and the particular species that are posted in a given year may change slightly due to a variety of circumstances. Last update March 31, 2017