Thallus spreading in irregular pathces 5-12(-20) cm diam., corticolous or saxicolous, easily peeled off substrate at maturity, thin (0.9 mm thick), brittle, raised in irregular mounds, olive-green to yellowish-green or buff, dark glaucous green in shade, or shining in parts, wrinkled uneven. Lower surface matt, corticate, brownish-yellow, or buff, bullate-uneven. Prothallus marginal, pale brownish or whitish, crenulate 0.2-0.8 mm wide. Perithecia immersed, globose, in raised tubercles 0.5-0.8(-1.2) mm diam., ostiole brown or brown-black, depressed, at first closed, then open. Ascospores 8 per ascus, colourless, fusiform-ellipsoid, apices slightly apiculate or rounded, muriform, 20-24 locular in c. 6 vertical series, 40-150 × 22-40 µm.