Order: Lecanorales       Family: Lecanoraceae Species: Lecanora sulphurea Growth type crustose. Photos: On acidic coastal rocks. Dunmanus Bay, Cork, SW Ireland. Identified by Mike Simms Thick warted and cracked, yellowish-grey to bright yellow-green thallus surrounded by greenish-black prothallus. The immersed pale, irregular apothecia become blackish with pale grey pruina. Exposed nutrient-rich siliceous walls and rocks, also parasitic on Tephromela and Lecanora species. Found on coast and inland. K- or K+ dirty-yellow, KC+ yellow

Lecanora sulphurea on acidic coastal rocks. March 2009