Description: Thallus crustose, episubstratic, areolate-subsquamulose, grey,. developing on the thalli of Buellia tirolensis. Medulla white, not amyloid, I-. Apothecia lecideine, black, 0.3-0.5 mm across, sessile but not constricted at base, with a flat, epruinose disc, and a thin, prominent proper margin. Proper exciple 18-25 |µm wide, dark brown to brown-black in outer part, colourless within, N-, aethalea-type; epithecium brown; hymenium colourless, c. 55 |µm high, without oil droplets; hypothecium dark brown, c. 100 |µm high. Asci 8-spored, clavate, Bacidia-type. Ascospores 1-septate, not constricted at septum, brown, broadly oblong, 9-5-11 x 5-9 |µm, Physconia-type, with a psilate ornamentation. Photobiont chlorococcoid. Spot tests: thallus and medulla K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.
Note: hitherto known only from the type collection, on granite near the coast.