Description: Thallus squamulose, of imbricate, 3-7 mm wide, 0.3-0.5 mm thick, pale to dark brown, lobate squamules forming flattened to convex pillows. Lower surface pale brown, without rhizohyphae, attached by up to 1 mm thick and to 15 mm long, simple or sparingly branched, pale rhizines. Upper cortex paraplectenchymatous, 50-70 µm thick, of 5-8 µm wide cells, with a thin epinecral layer; medulla white, prosoplectenchymatous; lower cortex clearly delimited from the medulla, with rounded to angular cells. Perithecia black, pyriform to globose, up to 0.55 mm across, immersed in the squamules, without involucrellum. Exciple colourless; paaraphyses absent, substituted by periphyses. periphyses. Asci 8-spored, clavate, the wall I-, with biseriately arranged spores. Ascospores 1-celled, hyaline, broadly ellipsoid. 13-17 x 6.5-8.5 µm. Pycnidia laminal, immersed in the squamules, inconspicuous. Conidia bacilliform, 4.5-8.5 x 1-1.5 µm. Photobiont chlorococcoid. Spot tests: cortex and medulla K-, C-, KC-, P- UV-. Chemistry: without lichen substances.
Note: a mainly Mediterranean species growing on weathered calcareous rocks, often in fissures, known from the Balkan and the Iberian Peninsulas; to be looked for in Italy.