10 species
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Aspicilia cinerea
Description: Thallus pale to dark greenish-grey, sometimes yellowish, rimose-areolate to somewhat verrucose. Apothecia 0.4-1.2 mm in diameter, black, level with surface of thallus.
Distribution: Washington; western and midwestern states to Arizona and northern New Mexico, northern US, Carolinas, Tennessee, Virginia, with disjuncts in Missouri and Texas; Canada.
Habitat: Usu. in sun.
Substrate: On siliceous rock.