Rhizocarpon quinonum

Rhizocarpon quinonum is a species of saxicolous (rock-dwelling), crustose lichen in the family Rhizocarpaceae. It was discovered and described in 2016 from specimens collected in Katmai National Park and Preserve, Alaska. This small lichen forms brown to blackish-brown patches on non-calcareous rocks and scree in alpine environments at elevations between 565 and 1,140 m (1,854 and 3,740 ft) along Alaska's Aleutian Range. The species is distinguished from similar lichens by its chemical profile, particularly its content of anthraquinone...