Thallus crustose, spreading, loosely attached, to 2 mm thick, roughened, dirty yellowish-brown or brownish-white, matt, roughly verrucose, areolate, verrucae rounded or rarely oblong, 0.5-2 mm diam., separated by gaping cracks, convex, corrugate-uneven, pulvinate to 3 mm tall at centre, somewhat cephalodium-like, saxicolous. Perithecia immersed, disc minute, punctiform, black, matt, 0.05-0.2 mm diam., rounded. Paraphyses filiform, sparingly branched, ± intricate. Asci frequent, oblong-clavate, apices rounded, 8-spored. Ascospores biseriate, oval-oblong, straight, 10-12(-15) × 5 µm. Pycnidia immersed in verrucae near perithecia, oblong or flask-shaped, 0.1 × 0.05 mm. Conidia short, bacillar, 3 × 0.5 µm.