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...