Description: Thallus crustose, endosubstratic or thinly episubstratic, continuous to obscurely areolate, white to grey, often forming large patches. Apothecia biatorine, rounded or irregular in outline, sessile and constricted at base, sometimes confluent, 0.2-0.3(-0.5) mm across, with a whitish, pale pink-brown, beige or pale grey-brown, often tuberculate, epruinose, convex disc, and an indistinct or very thin, usually paler, soon excluded proper margin. Proper exciple colourless, laterally 20-50 µm wide, of radiating hyphae with elongated lumina; epithecium colourless, not differentiated from the hymenium; hymenium colourless, 30-50 µm high, I+ blue; paraphyses coherent, simple or sparingly branched in upper part, 1-2 µm thick at mid-level, the apical cells 1.5-2.5 µm wide; hypothecium colourless. 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 an I+ red-brown, K/I+ blue outer layer, the ocular chamber relatively small, Biatora-type. Ascospores 1-celled (rarely a few 1-septate), hyaline, ellipsoid, 8-13(-17) x 2-3.5 μm. Pycnidia beige to pale brown, half-immersed in thalline warts, the wall colourless. Conidia thread-like, 24-51 x 1.5-2 µm, often protruding from the pycnidia as a white cap. Photobiont chlorococcoid. Spot tests: thallus K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.
Note: on smooth, acid bark. The species does not belong to Lecidea s.str.; Printzen (2014) found a close relationship with Lecania.