Lecanora subcarnea

Lecanora subcarnea is a species of crustose lichen in the family Lecanoraceae, first described in 1792 as Lichen subcarneus by Swedish botanist Samuel Liljeblad and later transferred to the genus Lecanora by Erik Acharius in 1810. The lichen forms a continuous white to pale yellowish-grey thallus with small areoles, distinctive pinkish to pale grey-brown apothecia (fruiting bodies) covered in white powdery crystals, and produces chemical compounds including atranorin and protocetraric acid that yield characteristic reactions in spot tests. It grows primarily in sheltered cracks of silica-rich rocks with high base content, occurring locally in parts of the United Kingdom including northern England, Wales, Scotland, and the Channel Islands, though some historical records from southwest England, Pembrokeshire, and Ireland have been determined to be misidentifications....read more on Wikipedia.