Picture taken at Turó Catiu d'Or, Montseny, Barcelona, 1.650 m. altitude, well light place.
Common lichen in Europe, on smooth siliceous rocks and graveyards. In Catalonia, it appears always on siliceous rocks in rainy areas, Montseny, Pyrenees and in some Maresma places.
Crustose lichen, saxicolous, thallus grey to brown, cracked, areolate, with a clear black prothallus at the borders. Lecideine apothecia, black, among the areoles, deformed, in some cases uo to a 1 mm in diameter,