Lecania sylvestris var. umbratica (Arnold) M. Mayrhofer
in Nimis & Poelt, Studia Geobot., 7, suppl. 1: 112, 1987. Basionym: Biatorina proteiformis f. umbratica Arnold - Flora, 57: 569, 1874.
Distribution: N - Frl. C - Sar.
Description: Thallus crustose, endosubstratic or of scattered granules, white to yellowish white, poorly evident. Apothecia 0.3-0.4 mm across, usually sparse, rounded, with a reddish brown to dark brown, slightly convex disc, without an evident thalline margin (with a few algal cells restricted to the lower edges of the apothecium). Proper exciple thin, poorly evident; epithecium yellowish brown to brown; hymenium colourless or yellowish in upper part, 60-85 µm high; paraphyses few, hardly exceeding the number of asci, coherent, not or only slightly swollen at apex. Asci 8-spored, narrowly clavate, with a K/I+ blue tholus and a central non-amyloid area, Bacidia-type. Ascospores 1-septate, hyaline, ellipsoid, thin-walled, 11-16 x 4-7 µm. Photobiont chlorococcoid. Spot tests: thallus K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.
Note: a mainly temperate lichen of calcareous rocks, probably more widespread in southern Europe.