Thallus small, orbicular, to 2 cm diam., thin and very closely attached to substrate, corticolous. Lobes narrow, to 0.5 mm wide, overlapping or distinctly separated. Upper surface brownish-grey or greyish-brown to dark brown, darker at lobe margins, sorediate. Soralia laminal, small, spot-like, usually abundant centrally. Lower surface hardly visible on account of the lobes being very closely attached to the substrate. Rhizines short, very sparse, indistinct. Apothecia rare, to 1 mm diam. Ascospores 1-septate, 13-18 × 7-10 µm. Pycnidia immersed. Conidia filiform 15-20 × 1 µm.

Thallus lobate, rosette-forming, to 2.5 cm diam., closely attached, corticolous. Lobes rather crowded, slender, laciniate, 0.2-0.25 mm wide, stellate-radiating, linear, irregularly or subdichotomously branching, margins uneven, swollen in parts, without cilia, apices rounded or slightly notched, crowded centrally often ± lobulate. Upper surface smooth, ± plane, matt or shining, greenish to brownish-white. Lower surface brownish-black, densely rhizinate. Rhizines brown or black, slightly thickened, simple or branched. Apothecia sessile, constricted at base, scattered, to 0.8 mm diam., disc black or brownish, epruinose, plane, margins thick, entire, concolorous with thallus. Ascospores biseriate, oblongellipsoid, straight or curved, 16-21 × 8-9 µm. Chemistry: Cortex and medulla K+ yellow. Atranorin and zeorin.