| Summary: | A description is provided for , which, in the British Isles, is most frequently observed on mossy trunks, especially and , but also on mossy rocks. Some information on its associated organisms and substrata, habitat, dispersal and transmission, and conservation status is given, along with details of its geographical distribution (Africa (Ethiopia, Kenya, Malawi, South Africa, Tanzania), North America (Canada (New Brunswick), Mexico, USA (Arizona, Colorado, New Mexico, Utah, Texas, West Virginia)), Central America (Costa Rica, El Salvador, Guatemala, Panama), South America (Argentina, Bolivia, Brazil (Rio de Janeiro), Chile, Colombia, Ecuador, Guyana, Peru, Venezuela), Asia (Bhutan, China (Sichuan, Yunnan), India (Arunachal Pradesh, Nagaland, Tamil Nadu, Uttarakhand), Pakistan, Papua New Guinea, Philippines, Sri Lanka, Thailand), Atlantic Ocean (Portugal (Azores, Madeira), Spain (Canary Islands)), Australasia (Australia (Victoria), New Zealand), Caribbean (Cuba, Dominican Republic, Haiti, Jamaica), Europe (Ireland, Norway, Portugal, Spain, UK), Indian Ocean (French Southern and Antarctic Lands (Amsterdam and St Paul Islands), Mauritius, Réunion)). This species is routinely used in the British Isles as an indicator when making ecological assessments, and specifically as an indicator of ecological continuity, particularly in the west of Ireland and the west of Scotland, and of oceanic and temperate rain forest.
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