Order: Pertusariales Family: Pertusariaceae
Species: Pertusaria flavicans
Photos: On coastal rock. Zetland Pier, Co. Cork, SW Ireland.
Photographs confirmed by John Douglass.
Thick, smooth, warted or cracked-areolate thallus, yellow or yellowish-green. Numerous granular soralia, usually paler in colour than thallus. Apothecia rare, dark ostioles with thick margins.
Found on siliceous upland and coastal rocks.
Thallus: K-, C+ orange, KC+ orange, P-, UV + orange.
Soralia: C+ orange, UV+ bright orange
Pertusaria flavicans showing KC+ orange reation. September 2009