Pertusaria luteola

Crustose epiphitic, on smooth bark, (we have seen it on Quercus ilex)
Note: thallus K+ yellow to red with red cristal in the medulla:
Thallus KC+ orange:
Asci bi-spored:
Spores colorless, ellipsoidal, 70-95 x 25-35 micras, striated wall:
An apothecium per wart, ostiole closed, black:
Phorophyte: Quercus ilex
Altitude: 1.240 m
Municipality: Tabernas