Thallus epi- or endophloeodal, greyish-white, pale greenish-white to yellowish-white, or ± lacking of effuse, matt or slightly roughened, often ± waxy, continuous or irregularly to coarsely areolate-cracked, in irregular patches, 1-5(-8) cm diam., delimited at margins by a narrow, irregular, black line. Perithecia frequent and conspicuous, emergent, 0.5-1.8 mm diam., discrete, rarely 2-3- confluent, rounded, flattish to distinctly convex, subglobose and even slightly constricted at base in specimens where cortex is eroded or lacking, pale whitish at first, obscured by a thin covering of cortical cells, then black, matt or shining, sometimes eroding and leaving small pits. Ostiole central, depressed, gaping or papillate. Pycnidia minute, black, punctiform, scattered. Ascospores uniseriate, oblong-ovoid, lemon-shaped, (15.3-)17-22(-25) × (8.3-)10.2-11.9 µm. Chemistry: Cortex K+ yellow-dirty brown. TLC-.