Distribution: N - TAA, Piem (TSB 33968). C - Abr (Gheza & al. 2021). S - Bas (Nimis & Tretiach 1999), Si.
Description: Thallus crustose, edosubstratic and poorly evident to episubstratic and areolate, whitish to ochre-coloured, forming 1-3 cm wide patches. Apothecia lecideine, black, somehow glossy, 0.3-0.9(-1.5) mm across, sessile and more or less constricted at base, with a flat to slightly convex, epruinose disc, and a smooth, finally excluded proper margin. Proper exciple violet-black, with a paler outer rim, K+ and N+ purple; epithecium dark blue-green, K+ and N+ purple; hymenium greenish, rarely colourless, 50-75 μm high, I+ reddish; paraphyses 1.5-2 μm thick at mid-level, the apical cells to 6-8 μm wide, surrounded by a pigmented gel; hypothecium coloured as the exciple 110-250 μm high, K+ and N+ purple. Asci 8-spored, subcylindrical, surrounded by a gelatinous I+ blue coat, with a well-developed I+ blue tholus with a I+ darker blue tube and a well-developed ocular chamber, Bacidia-type. Ascospores 1-septate, hyaline, sometimes slightly constricted at septum, oblong-ellipsoid, (8-)9-12(-13.5) x 3.5-5.5 μm. Pycnidia black, globose to pyriform. Conidia thread-like to sickle-shaped, 5.5-15.5 x 0.5-1.2 μm. Photobiont chlorococcoid. Spot tests: thallus K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.
Note: on more or less calcareous substrata in upland areas; the generic position is still an open problem.