Thallus spreading in irregular patches, thin, continuous, irregularly wrinkled, plicate or minutely papillate, matt, olive-green, rarely minutely areolate-cracked, in parts minutely maculate (×10 lens). Apothecia numerous, from minute pin pricks to swollen dimples or papillae, to 1.0 mm diam., frequently less, pore neatly rounded, 0.02-0.3 mm diam., margins swollen, entire, concolorous with thallus or ± buff coloured, exciple detached, disc whitish-pruinose, grey-black below. Exciple carbonised. Columella absent. Hymenium colourless 115-130 µm thick. Hypothecium c. 22 µm thick, grey-black. Paraphyses filiform, dense, slightly thickened at apices. Asci 8-spored, spores slightly spirally arranged. Ascospores colourless, ovoid-ellipsoid, pointed at one end rounded at other, straight or slightly curved, 6-10-locular, 26-34 × 6.8-8.3 µm. Chemistry: Thallus K+ yellow → red. Salazinic acid with traces of stictic and constictic acids.