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.

Thallus yellowish-olive to pale yellow-grey or fawnish, in irregular patches or bands, 2-8(-12) cm diam., smooth, waxy, continuous, rarely irregularly cracked, matt or shining, often with minute, scattered, white spots (×10 lens), corticolous. Perithecia ± immersed to emergent, in scattered, rounded to irregular verrucae, 1-3 mm diam., flattened to slightly swollen, subhemispherical, often ± covered with cortex and bark cells and appearing ± frosted, eventually black and shining, 1-4 perithecia in a stroma, involucrellum 10-60 µm thick, black carbonaceous, exciple brownish-yellow, 10-25 µm thick. Ostiole apical, 0.1 mm diam., flat, subpunctate or slightly raised, yellow-brown or reddish to black, occasionally whitish-grey, often open to interior or perithecial cavity. Ascospores broadly ellipsoid or oblong with pointed ends, muriform, 7-11 transverse septa and with 2-5 locules per tier, 60-70 × 30-35 µm, wall 1.5-2 µm thick.