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