Thallus foliose, monophyllous, appearing umbilicate, attached to substrate by several disc-like holdfasts, saxicolous. Lobes to 1.5 cm diam., margins slightly incised or crenulate, often coarsely sorediate. Upper surface matt, or ± scabrid, greyish-brown, with rounded, maniciform, coarse-grained bluish soralia. Lower surface pale pinkish-white, verrucose, often ± faveolate-lacunose, occasionally with coarse, bluish soralia. Apothecia very rare, to 1 mm diam., erupting through upper cortex, pushing forward a thalline margin concolorous with thallus, sometimes heavily sorediate, disc plane, matt, brown. Hymenium (90-)100-120 µm tall, upper part pale brown, I+ deep blue. Paraphyses simple, rarely bifurcating at apices, 2 µm thick, slightly expanded at apices with brownish pigment externally. Asci broadly clavate, (70-)75-80(-85) × 20-25 µm, tapering towards base, thick-walled especially at apex, with an external amyloid cap. Ascospores 8 per ascus, colourless, thin-walled, (2-)3-septate, (15-)20-25 × 7-8 µm. Chemistry: TLC nil.