Thallus in irregular bands or patches, 1-6 cm diam., olive brownish or greyish-yellowish to greyish-cinerascent, matt, smooth to slightly roughened, ± deeply cracked-areolate, corticolous. Perithecia immersed (1-5 in a stroma) in scattered verrucae, 1-2.5 mm diam., rounded to somewhat irregular, hemispherical, single or 2-3 confluent, involucrellum 11-40 µm thick, carbonaceous, exciple reddish-brown or pale yellowish-brown, 10-30 µm thick. Ostiole apical, 0.05-0.1 mm diam., slightly depressed, grey-white to red-brown. Ascospores uniseriate, ovoid-ellipsoid, submuriform, 5-6 transverse septa with 1-2 locules per tier, (30-)35-40 × 11-12 µm, wall 1-1.5 µm thick.