Wikipedia
Diploschistes
Diploschistes (crater lichen) is a genus of crustose lichens with a thick, cracked ( areolate) body ( thallus) with worldwide distribution. The fruiting part ( apothecia) are immersed in the thick thallus so as to have the appearance of being small "craters.
It is in the family Thelotremataceae. The widespread genus contains about 43 species. Johannes Musæus Norman described the genus in an 1853 publication.