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.
Conservation Status: Not of concern
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.