Bellemerea alpina

Bellemerea alpina, the brown sunken disk lichen, is a white to pale tan, thick crustose areolate lichen that grows on rock in the mountains worldwide. It grows in arctic-alpine habitats in Eurasia, North America (south to California and Arizona), Australia, and New Zealand.: 228  Areoles are sometimes contiguous and sometimes dispersed.: 228  It often has very visible black prothallus.: 228  The brown to tan apothecia have a purplish tinge and are grayed by a pruinose coating, and embedded in the areoles, giving a similar appearance to members of the genus Aspicilia.: 228 ...read more on Wikipedia.