Umbilicaria leiocarpa

Umbilicaria leiocarpa, commonly known as textured rock tripe, is a species of saxicolous (rock-dwelling), umbilicate lichen in the family Umbilicariaceae. First described by Augustin Pyramus de Candolle in 1805, it is characterised by its small to medium-sized grey thallus with a cracked upper surface and smooth reproductive structures. The species has a primarily Holarctic distribution, being found across Europe from Fennoscandia to the Pyrenees, with populations occurring from sea level to alpine elevations around 2,000 m (6,600 ft). It shows a particular preference for siliceous rock substrates and is absent from northern Lapland despite being common in similar habitats elsewhere in Fennoscandia. The species belongs to the subgenus Agyrophora, one of eight recognised subgenera within Umbilicaria, and is distinguished by its smooth, non-pustulate thallus and distinctive asexual reproduction through specialised structures called thalloconidia....read more on Wikipedia.