Pertusaria monogona

Crustose saxicolous, on siliceous rocks near the coast or places with mild winters.
Note: thallus K+ yelow, later blood red, C-. Asci with only one spore, which has thick wall, 100-300 x 50-100 micras:
Lithology: andesite.
Altitude: 70 m
Municipality: Níjar