Order: Pertusariales       Family: Megasporaceae Species: Circinaria caesiocinerea (Aspicilia caesiocinerea) Growth type crustose. Identified by John Douglass Photos: On rock. Gougane Barra, Co. Cork, SW Ireland. 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. Asci (4-)6-8 spored and the spores are very variable in size and often poorly developed, 14-30 × 7-16 µm. Cortex and medulla: K-, P- Found on nutrient-rich siliceous rocks, often near water. Inland and coastal distribution and the commonest K- Aspicilia-like species on siliceous rocks

Circinaria caesiocinerea (Aspicilia caesiocinerea). August 2009