Thallus cream, white or pale ochraceous, uniformly thin, somewhat immersed, ± continuous, cortex an ill-defined, superficial layer of necrotic cells mixed with sloughed bark cells, interspersed with calcium oxalate crystals; prothallus absent. Soredia and isidia absent. Photobiont Trentepohlia. Anamorph: not known. Teleomorph: ascomata apothecia 0.4-0.7 (-0.8) mm diam., flattened, not immersed in warts, erumpent, urceolate; ostiolar opening to 0.3 mm wide; true exciple free, colourless, ± radially stellate-lacerate, partly obscuring the black to ± densely grey-white pruinose apothecial disc; hymenium (90-) 100-120 (-130) µm, colourless, I–; hypothecium colourless; epithecium colourless to pale brown, encrusted with numerous, small, irregular crystals. Interascal tissue of filamentous, unbranched, rarely septate paraphyses; periphysoids lining the upper inner surface of the true exciple. Asci subcylindrical, with a single functional wall layer, abruptly thickened at the apex, sometimes with a minute internal apical beak, K/I–, (4-) 6- to 8-spored. Ascospores (30-) 35-50 (-55) × (7-) 8-10 µm, cylindrical to broadly cylindric-fusiform with rounded ends, remaining colourless when mature, with (7-) 9-11 (-12) strongly thickened lateral distosepta and no longitudinal septa, I+ purplish blue, with a perispore that appears to be constricted between the septa. Chemistry: thallus C–, K–, KC–, Pd–, UV– (no lichen products detected by TLC).