Species: Lecanora gangaleoides
Photos: On acid coastal rock. Dunmanus Bay, Cork, SW Ireland.
Greenish-grey, warted or smooth thallus with white prothallus. Apothecia with wide thalline margin, black convex discs. Thecium dark greenish. Scratching the discs or thallus reveals orange anthraquinones.
K+ yellow, P+ orange, UV- or pale orange. The apothecia are greenish-brown in section.
Distribution is mainly coastal, on acidic rocks.
Similar: Tephromela atra. Less warted thallus, thecium purplish. UV+ bluish
Immediately above: Lecanora gangaleoides on harbour wall, Bantry, Co. Cork