Alpine Brown Sunken Disk Lichen

Bellemerea alpina (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...