Description: Thallus non-lichenized, indistinct, immersed in the thalli of species of the Lecanora polytropa-group. Apothecia biatorine, 0.2-0.3 mm across, black, somehow glossy, sessile, often clustered, with a strongly convex disc, without a distinct proper margin. Proper exciple thin, black; epithecium bright blue-green to almost black, N+ purple-red; hymenium colourless in central part, blue-green in upper part, brownish in lower part, 45–50 µm high; hypothecium black-brown, continuous with exciple, c. 70 µm high. paraphyses conglutinated, simple, 1-2 µm thick at mid-level, he apical cell to 2.5 µm wide. Thallus crustose, episubstratic, areolate to areolate-verrucose, yellowish, brownish yellow to orange-brown, often glossy, of 0.5-4 mm wide, contiguous and convex areoles developing on a black hypothallus, forming patches to 10 cm in diam., often delimited by a black prothallus. Cortex pale grey in upper part, 40-60 µm thick, with a 15-40 µm thick epinecral later; medulla white, I-. Apothecia biatorine, black, 0.5-3(-4) mm across, with an initially flat, then irregularly convex, epruinose disc, without a distinct proper margin. Proper exciple strongly reduced; epithecium bluish green-black, sometimes in part brown, N+ violet; hymenium colourless, 40-50 µm high; paraphyses coherent, strongly swollen in water, 4-5.5 µm thick at base, the apical cells 5-8 µm wide; hypothecium colourless in upper part, pale yellow-brown in lower part. Asci (4-)8-spored, clavate, very thin-walled, with a K/I+ blue, tall tholus penetrated by a faintly amyloid apical cushion, the wall K/I-, surrounded by a blue outer layer, Lecanora-type. Ascospores 1-celled (rarely 1-septate), hyaline, fusiform to bacilliform with rounded ends, 8-12 x (2-)3-4.5 µm. Photobiont absent. Spot tests: all negative. Chemistry: without lichen substances.
Note: a lichenicolous fungus, certainly much more widespread in the Alps.