16 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.
Aspicilia contorta
Description: Thallus olive-grey to dark olive, thick, frequently with depressed areoles. Apothecia pruinose, deeply immersed, usu. one per areole.
Distribution: Washington; western and midwestern states to Texas. British Columbia, Alberta, Saskatchewan.
Substrate: On calcareous and non-calcareous rock.
Aspicilia hispida
Description: Thallus fruticose, olive green to blue-green, forming clumps up to 3 cm. in width. Branches 0.5-1 mm in diameter, irregular and terete.
Distribution: East of Cascades crest in Washington; Eastern Oregon, Idaho, Montana, Wyoming, Nevada, Utah, New Mexico; Southern British Columbia, Alberta, Saskatchewan.
Habitat: Open, dry prairie.
Substrate: On calcareous soil and pebbles.