Verrucaria calciseda

Crustose endolithic, saxicolous, usually lapidicolous, on calcareous rocks.
Note: radiating cracks running from the perithecial pits:
Spores simples, colourless, ellipsoidal, 18-26 x 8-13 micras.
Lithology: limestone
Altitude: 70 m
Municipality: Almería