Aspiciliopsis macrophthalma

Aspiciliopsis macrophthalma is a species of lichen-forming fungus in the family Trapeliaceae. It is a crust-forming lichen with a thick, brittle-looking thallus that spreads across rock as a cream to pale pinkish-grey patch. The surface is usually continuous but often breaks into sharp-edged cracks, giving it a broken "paving" look, and it can be faintly roughened and patchily dusted with a thin whitish bloom (pruina). Its fruiting bodies are apothecia that sit mostly embedded in the thallus (an aspicilioid form): small, round pits with a pale to dark reddish-brown (sometimes almost blackish) disc, and a thallus-coloured rim that is neatly set off from the surrounding crust by a crack. The thallus also contains embedded cephalodia that may be easiest to pick out when wet, when they can turn a dark purplish-blue and look slightly different in texture from the rest of the thallus. Under the microscope, the species has a tall, colourless hymenium and produces colourless, broadly ellipsoid......read more on Wikipedia.