Thallus effuse, evanescent, thin, pale to dark grey-brown, often minutely granular; granules 15-70 μm diam., often scattered giving a minutely speckled appearance when on light-coloured bark. Photobiont Dictyochloropsis, with cells 5-9 μm diam. Anamorph: not known. Teleomorph: ascomata apothecia, 0.2-0.6 (-0.8) mm diam., reddish brown to dull black. Thalline exciple absent, true exciple dark, at first prominent, later sometimes excluded, dark brown at the edge, hyaline to pale brown within, the hyphae coherent in K, 1.5-2.5 μm diam. but thicker-walled at the outer edge. Disc at first concave, later flat or weakly convex. Epithecium yellowish to dark brown, K–, N–. Hymenium 60-75 μm tall, hyaline. Hypothecium hyaline to mid brown. Interascal tissue of narrow paraphyses 0.8-1 μm diam., the apices ± swollen to ca 2 μm wide, often with a dark brown hood 3(-4) μm diam., sometimes branched and anastomosed especially towards the base. Asci clavate, 8-spored, Catillaria-type. Ascospores 10-15 × 5-7 μm, rather variable in shape but mostly ellipsoidal to clavate, with a ± median septum, the walls smooth, to 1.5 μm thick and at least sometimes two-layered, then apparently without an epispore or gelatinous sheath. Chemistry: lichen products not detected by TLC.