Description: Thallus crustose, episubstratic, whitish grey, rimose areolate or areolate, rarely thin and poorly evident. Apothecia irregularly rounded, 0.3-0.7(-1.5) mm across, with an ochraceous yellow to pale yellowish red, flat to convex disc, and an ochraceous yellow, persistent proper margin; a thalline margin is sometimes visible at the base of young apothecia. Epithecium yellowish brown, c. 20 µm high, inspersed with granules, K+ red; hymenium colourless, 55-60 µm high; paraphyses simple or sparingly branched in upper part, the apical cells swollen; hypothecium colourless. Asci 8-spored, clavate, Teloschistestype. Ascospores 1-septate, polarilocular, hyaline, 12-20 x 5-7 µm, the septum 2-3 µm thick. Photobiont chlorococcoid. Spot tests: thallus K-, C-, KC-, P-; apothecia K+ red. Chemistry: thallus probably without lichen substances; apothecia with an unknown set of anthraquinones.
Note: on horizontal to subvertical surfaces of non-calciferous schists in sunny situations. This species was synonymised by Nimis & Martellos (2008) with Rufoplaca arenaria, but according to Roux & coll. (2014) it clearly differs in the well-developed thallus, the ochraceous yellow apothecia and the somewhat longer spores. It is hitherto known only from Liguria and southern France, and it probably belongs to Rufoplaca.