Order: Lecanorales       Family: Lecideaceae Species: Lecidea fuscoatra Growth type crustose. Photos: On acidic rocks in the Burren and Co. Cork, Ireland. Image below: On granite boulder. Black Head, the Burren. BLS meeting 2009 Cracked red-brown to greyish areoles surrounded by black prothallus. Immersed black apothecia are often white pruinose, sometimes convex with persistent margin. Common on nutrient-rich siliceous rocks, also on old brick walls. Upper cortex only: C+ red

Immediately above: Lecidea fuscoatra. Gougane Barra, August 2009. Identified by John Douglass