Species: Pertusaria corallina
Photos: On acidic upland rock. Ballingeary, Cork, SW Ireland.
Thick, warted, white or whitish-grey thallus with white prothallus. Centre covered with abundant long, white isidia. Apothecia rare.
Thallus: K+ persistent yellow, KC+ yellow, P+ orange, UV-
Common on exposed, siliceous, upland and coastal rocks.
Host to the lichenicolous fungus Sclerococcum sphaerale.
Similar: P. pseudocorallina. K+ yellow turning red.
Pertusaria corallina. February 2009