Lepra albescens (Huds.) Hafellner morpho corallina forme saxicole.

    Thallus crustose, 5-10 cm diam., more or less circular, rather thick, cracked towards the center, thinner, wrinkled to pleated and sometimes torn towards margin, whitish,  pale grey, covered towards the center with nodules and irregular warts and indistinct soralia, prothallus conspicuous, rosette-shaped, brownish to dark-brown. Chemical spot tests negative. This form is rather rare. Grows on schists and slates in shaded areas.