Thallus thin to thick, continuous, smooth or faintly rimose-cracked, even or becoming coarsely and unevenly low-warted, often forming wide-spreading, complex mosaics, pale grey to pale brown, dark brown or dark olive-green, ± refractive with closely packed granules, K–. Prothallus visible between the thalline units, thin, persistent, dark brown to black. Soralia and isidia absent. Photobiont Trentepohlia. Anamorph: conidiomata pycnidia, 40-50 μm diam., frequent, immersed, visible as minute pallid to brown specks; the wall hyaline or pale brown above. Conidiogenous cells cylindrical, proliferating percurrently. Conidia 4-6 × 0.9-1.2 μm, ± cylindrical to bacilliform, hyaline, aseptate. Teleomorph: ascomata lirellate apothecia, usually very numerous, 100-250 × 50-100 µm, brown-black, deeply immersed, without a rim, minutely punctiform or ± shortly elliptical in surface view, often in dotted or thread-like lines. Epithecium pale to dark brown, semi-opaque, non-granular. Interascal tissue of paraphyses 0.8-1 μm diam., anastomosing, becoming more branched above, conglutinated, without swollen tips. Asci cylindrical to cylindric-clavate, fissitunicate, the apical dome with a short ocular chamber surrounded by a minute K/I+ dark blue ring; remaining part of apical dome and inner wall of ascus often K/I+ pale blue, 8-spored. Ascospores 28-38 × 4-6 μm, 4- to 6- (to 7-) septate, fusiform, straight to slightly curved, hyaline, fairly thick-walled, smooth, without a perispore or gelatinous sheath. Chemistry: thallus C–, K–, Pd–, UV– (confluentic acid).