Aspicilia confusa

Aspicilia confusa is a pale gray (sometimes brownish) crustose areolate lichen that grows mostly on rock in southern and central California mountains, from 250 to 3,170 metres (820 to 10,400 ft).: 224–5  Areoles may be contiguous or dispersed.: 224  It has a dark, fringed prothallus.: 224–5  Each areole commonly has 1–4 round to angular aspicilioid apothecia that are 0.1–1.5 mm in diameter, sunken into it. Each apothecia has a usually concave, black disc.: 224–5  Lichen spot tests are all negative.: 224–5  It grows on rock in chaparral or forests in central and southern California, including the Sierra Nevadas, but not in the southeastern deserts of California.: 224–5  ...read more on Wikipedia.