Thallus lobate, orbicular to spreading 5-12 cm diam., closely attached, corticolous. Lobes densely plicate-rugose centrally, imbricate at margins, margins entire, rounded, overlapping. Upper surface greyish-fawn or dirty greenish-grey, matt, scabrid or subpruinose in parts, wrinkled, often densely plicate. Lower surface pale or brown, rhizinate. Rhizines sparse, pale or brown. Apothecia frequent, sessile, constricted at base, scattered or densely crowded, rounded or contorted by mutual pressure, disc dark brown, concave at first becoming plane or subconvex with age, epruinose, margins thick, persistent, entire often ± crenulate, concolorous with thallus. Ascospores biseriate, ellipsoid or oblong, apices rounded, straight or slightly curved, 3-6(-8)-septate, (20-)27-44 × 11-24 µm.