Thallus microphylline-squamulose, of small, stellately incised, subimbricate squamules (0.1-1 mm long and 0.1-0.5 mm wide) spreading in a ± diffract crust over a thin, blue-black prothallus, in irregular patches 3-5(-8) cm diam. Upper surface matt, smooth, pale grey-blue to glaucous brown, densely isidiate. Isidia pale blue-white, fingerlike at first, soon becoming coralloid-branched, delicate, friable, often dense and then ± obscuring thallus. Apothecia rare, round to irregular, sessile, concave to plane, 0.2-0.5 mm diam., disc matt, red-to dark-brown, proper margin pale, thalline margin irregularly crenulate, often isidiate, concolorous with thallus. Hymenium 100-200 µm tall, upper part red-brown, pigment non-granular, external to apices of paraphyses. Asci elongate-ellipsoid, 90-100 × 10-12 µm, with an I+ blue plug. Ascospores 8 per ascus, smooth-walled, 12-15 × 6-8 µm. Chemistry: TLC nil.