Thallus corticolous, up to 7 cm diam., 30–70 µm thick, continuous; surface smooth to uneven-verrucose, greenish grey, with scattered isidioid outgrowths; isidoid outgrowths globose to irregular, 0.05–0.1 mm diam. Thallus in section with cartilaginous upper cortex, irregular algal layer and large clusters of crystals; photobiont trentepohlioid. Apothecia lirelliform, flexuose, stellately branched and aggregate into pseudostromatic clusters, prominent to sessile, with thick, almost complete thalline margin leaving only the uppermost part of the labia exposed, 1–3 mm long, 0.3–0.5 mm wide, 0.25–0.35 mm high; disc concealed; proper margin thick, labia entire, grey-black; thalline margin thick, covering the labia except for the uppermost part, white-grey and contrasting with the darker surrounding thallus. Excipulum completely carbonized, 50–100 µm wide, black; laterally covered by algiferous thallus lacking crystals; hypothecium prosoplectenchymatous, 10–15 µm high, colourless to pale yellowish; hymenium 150–200 µm high, colourless, clear; epithecium granulose, 10–15 µm high, olive brown. Paraphyses unbranched; asci fusiform to clavate, 130–180 x 30–40 µm. Ascospores 2–4 per ascus, oblong to cylindrical, 15–25-septate, 100–150 x 14–17 µm, 7–9 times as long as wide, colourless, with thin gelatinous caps at both ends. Secondary chemistry: no substances detected by TLC.