Thallus greyish or whitish-grey to sordid greyish-brown, very thin, often blotchy, roughened-uneven, minutely areolate-cracked, in irregular patches, 1-8 cm diam., limited by a thin, black prothallus, corticolous. Apothecia delicate, small ± innate, erupting through cortex, irregularly sulcate, sigmoid or stellate to ± rounded 0.5-1.5 mm long and 0.05 mm wide, thalline margin, slightly raised, thin, whitish, disc black carbonaceous, epruinose, roughened. Hypothecium brown. Epithecium granular, olive-black. Ascospores acicular, 3-septate, 32-40 × 1.5-2.5 µm. Chemistry: Nil.