Description: Thallus crustose, endo- to episubstratic, continuous to granular-verrucose, forming more or less continuous, sorediate patches, sometimes with a subleprose appearance, without a distinct prothallus. Areoles greyish green, irregular, convex, 0.1-0.2 mm in diam.; continuous thallus parts tuberculate; soralia yellowish green to pale yellow, bursting from areoles or tubercles, irregular in outline, to 0.1-0.2 mm in diam., soon becoming confluent into a more continuous, subleprose crust; soredia farinose, 15-20(-30) μm in diam., often gathered into larger, irregular consoredia. Medulla not developed. Apothecia rare, biatorine, 0.4-1 mm across, constricted at base, pale flesh-coloured to blackish brown, with a finally strongly convex, often tuberculate disc, and a thin, paler, soon excluded proper margin. Proper exciple colourless in outer part, pinkish brown within, 60-80 μm wide; hymenium colourless or with small brown spots, 50-80(-100) μm high; hypothecium colourless, 120-240(-300) μm high. Asci 8-spored, clavate, with a K/I+ blue apical dome penetrated by a narrow, K/I– apical cushion surrounded by a narrow, deeply K/I+ blue zone, the wall K/I- but surrounded by a I+ red-brown, K/I+ blue outer layer, the ocular chamber relatively small, Biatora-type. Ascospores (1-)3-septate, hyaline, ellipsoid, 13-22(-25) x 4-7 μm. Photobiont chlorococcoid. Spot tests: thallus K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.
Note: on mossy trunks of deciduous trees, more rarely on siliceous rocks.
Growth form: Crustose
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly asexual, by soredia, or soredia-like structures (e.g. blastidia)