Lepra albescens (Huds.) Hafellner morpho corallina 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.