Order: Pertusariales       Family: Pertusariaceae Species: Lepra albescens var. corallina (Pertusaria albescens var. corallina) Growth type crustose. Photos: On tree trunk. Gougane Barra, Cork, SW Ireland. Identified by John Douglass Differs from Pertusaria albescens in having coarse knotted, warted or granular soralia and a thickened thallus. Found over-growing moss on bark and sheltered stones. Chemical reactions negative. Taste-test for oxalic acid negative. Similar: Pertusaria polythecia. Pale grey thallus comprised of fertile warts. Rare, endemic to SW Ireland on mosses on trees.

Immediately above: Pertusaria albescens var. corallina on Hawthorn twig. November 2009