Description: Thallus crustose, mostly episubstratic, very thin, continuous to rimose-areolate, smooth, ochre-orange, to pale brown, sometimes poorly evident, forming up to 8(-10) cm wide patches. Apothecia 0.2-0.5 mm across, at first immersed, later slightly prominent, with a concave to flat, ochre-orange to brown-orange disc, and a rather thick and prominent, finally often excluded margin. Epithecium pale reddish brown, N-, K-; hymenium colourless, 70-130 µm high; paraphyses mostly simple, submoniliform in upper part, the apical cells not swollen; hypothecium colourless. Asci 8-spored, cylindrical-clavate, the outer wall K/I+ blue, but the inner walls and apical dome K/I-. Ascospores 1-celled, broadly ellipsoid, 10-16 x 6-9 µm. Pycnidia reddish. Conidia short-bacilliform. Photobiont chlorococcoid (Asterochloris), the cells <15 µm wide. Spot tests: thallus K- C-, KC-, P-, UV-. Chemistry: without lichen substances.
Note: on siliceous rocks, including pebbles and stones near the soil, usually in upland areas; overlooked, or confused with small Acarospora species, to be looked for in the mountains of southern Italy. The record from Venezia Giulia in Nimis (1993: 317) has been excluded, as the locality is outside Italy. Perhaps this is a synonym of Ionaspis lacustris.