Pygmy pocket moss (Fissidens exilis) COSEWIC assessment and status report: chapter 10
Existing Protection or Other Status Designations
Fissidens exilis is currently ranked G3G4 (NatureServe 2005), indicating some uncertainty about the global population: a rank of G3 is reserved for species that are rare to uncommon, usually with between 20 and 100 occurrences worldwide, that may be susceptible to large-scale disturbances; G4-ranked species are common, usually with more than 100 occurrences, and are not susceptible to immediate threats (Ontario Natural Heritage Information Centre 2002). In Ontario, F. exilis is ranked S1 (March 2000), meaning that there are five or fewer known Ontario occurrences (ONHIC 2002). Across the international border, in New York, F. exilis is ranked SU, showing that its status is “uncertain because of the cryptic nature of the plant” (Clemants & Ketchledge 1993). No centralized database of rare moss occurrences exists in Quebec.
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