Order: Pertusariales       Family: Megasporaceae Species: Aspicilia caesiocinerea Growth type crustose. Photos: On rock. Gougane Barra, Co. Cork, SW Ireland. Identified by John Douglass Thallus usually thick, warted, cracked or areolate, light grey, often with bluish tinge. Prothallus grey when present. Apothecia have black discs with persistent, thin, entire margins. Found on nutrient-rich siliceous rocks, often near water. Inland and coastal distribution. Cortex and medulla: K-, P-

Aspicilia caesiocinerea. August 2009