16 species
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Physcia adscendens
Description: Thallus pale to dark grey, lobes narrow, 1-3 mm in width. Lower surface white to tan, typically pruinose. Rhizines present.
Distribution: Washington; Alaska to southern California, Idaho, Montana, Wyoming, Colorado, Utah, New Mexico, east of Mississippi with exception of Florida; Canada.
Habitat: Open areas.
Substrate: Bark and wood of various trees.