Species: Pertusaria pseudocorallina
Photo immediately below: On granite boulder. Black Head, the Burren, Ireland. BLS Burren meeting 2009
Smooth or warted, creamy-grey or yellowish-grey thallus. The short, round, brown-tipped isidia are frequently eroded and leave small craters in the thallus. Apothecia are rare, semi-globose.
Found on well-lit inland and coastal siliceous rocks, frequently occuring with P. corallina.
Cortex: K+ yellow turning red, P+ yellow, UV-
Similar: Pertusaria coccodes
Photo immediately above: Pertusaria pseudocorallina. Ballingeary, Co. Cork. July 2009