Sarcogyne regularis var. intermedia (Körb.) Golubk.

   Thallus most often absent or very thin and more or less endolithic and very inconspicuous, whitish, greyish-white, pale ochraceous. Apothecia scattered or in small groups, small, 0.5-1 mm in diameter, disk appearing pale blue-grey with a strong whitish pruine that persists for a long time (only old or washed apothecia have no pruine), margin distinct, black, disappearing in old age. Microscopic and chemical characters of the type. Not very rare taxon, typically coming on the mortar of old walls (of chapels in particular) sometimes on concrete.