American volcano

Ocellularia americana is a species of crustose lichen in the family Graphidaceae. Found in the southern United States, it was formally described as a new species in 1973 by Mason Hale. This bark-dwelling lichen forms pale, cream-colored to whitish warted patches on oak trees and is distinguished by its prominent disc-shaped fruiting bodies with distinctive central columns. It is the only member of its family known to produce gyrophoric acid, which gives it a unique chemical...