cinder lichen

Aspicilia cinera (cinder lichen) is a gray to almost white, 1.5 – 15 cm wide, crustose areolate lichen with large apothecia that mostly grows on rock in the mountains.:224 It grows in variable forms, from having a continuous surface to being areolate.:224 It grows in Eurasia, and North America on siliceous rock, schist or igneous rock in habitats exposed to sunlight, also rarely on calciferous rock. It is common in Arizona, and rare in California and Baja...