Columbian carpet moss (Bryoerythrophyllum columbianum) COSEWIC assessment and status report: chapter 9

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Population Sizes and Trends

Table 2 (Column D) lists sizes and trends for each confirmed population. Bryoerythrophyllum columbianum is uncommon or rare in seven sites, and relatively widespread but uncommon in four sites. Populations appear stable in nine sites, and two may be declining, but trends are unknown. Site monitoring is necessary in order to confirm population trends.

There is no detailed population information available about adjacent American populations in Washington, although it is a common component of some biological crusts in the central shrub-steppe regions of south-central Washington State (McIntosh 2003).