Carey’s small limestone moss (Seligeria careyana) grows in loose colonies of minute (1.6 mm – 2 mm), yellow- to light-green plants. The species is endemic to Haida Gwaii, British Columbia (B.C.) and is found nowhere else in the world. Three element occurrences (seven colonies) of Carey’s small limestone moss have been observed, all on Sadler limestone in shaded and humid locations in the very wet hypermaritime subzone, Haida Gwaii variant of the Coastal Western Hemlock biogeoclimatic zone (CWHvh3). Carey’s small limestone moss was designated as Endangered by the Committee on the Status of Endangered Wildlife in Canada (COSEWIC 2019) as it is endemic to Canada and only known from three locations in Haida Gwaii, British Columbia (B.C.). At time of writing, it is under consideration for listing as Endangered in Canada on Schedule 1 of the Species at Risk Act (SARA). In British Columbia, Carey’s small limestone moss is ranked S2 (imperiled) by the B.C. Conservation Data Centre (2022) and is on the provincial Red list. The main threats are mining and quarrying, climate change (drought; temperature extremes), and tsunamis. Recovery is considered to be biologically and technically feasible. The recovery/survival (population and distribution) goal is to improve the resilience of extant Canadian populations, and of any additional populations that are found, by managing human-caused threats in such a way that species abundance increases.
B.C. Ministry of Land, Water and Resource Stewardship. 2022. Recovery Plan for Carey's Small Limestone Moss (Seligeria careyana) in British Columbia. Province of BC, Ministry of Lands, Water and Resource Stewardship. Management Plan (Species at Risk)