Lepra albescens (Huds.) Hafellner morpho corallina forme corticole.
Pertusaria albescens var. corallina (Zahlbr.) Laundon forme corticole.
Thallus crustose, rather thick, more or less verrucose, wide prothallus often typically delimited and zoned, rounded-like, covered (sometimes almost entirely) first tiny isidia quickly giving rise to granular, warty or nodular soralia of a coarsely coralloid appearance, pale greyish, pale grey-greenish. Apothecia very scarce. Chemical spot tests negative. Rather rare, on mossy barks of deciduous tress in humid and shaded areas, sometimes mixed with Lepra albescens var. albescens in poorly-lit and shaded areas. See also Lepra albescens on rock notably in case of shaded schists and slates.
N.B. Watch out for Ochrolechia microstictoides whose thallus is not delimited by a roundel zone and whose soralia are C+ and KC+ slightly orange yellow.