Order: Pertusariales       Family: Pertusariaceae Species: Pertusaria pseudocorallina Growth type crustose. 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