Description: Thallus crustose-placodioid, episubstratic, ochre-yellow to ochre-orange, areolate in central part, clearly lobed at margin, forming up to 1 cm wide, orbicular, sometimes confluent patches; marginal lobes 0.3-0.7 mm wide, short and contiguous, flattened to weakly convex. Apothecia biatorine/zeorine, at first semi-immersed in the areoles, then sessile, with a bright orange disc and a somewhat paler, smooth proper margin. Epithecium brownish orange, K+ red; hymenium colourless; paraphyses branched in upper part, 1-1.5 µm thick at base, the apical cells up to 5 µm wide; hypothecium colourless. Asci 8-spored, clavate, Teloschistes-type. Ascospores 1-septate, polarilocular, sometimes slightly constricted at septum, hyaline, narrowly and long-ellipsoid to almost fusiform, straight or curved, 12-20 x 4-6 µm, the septum 1-4 µm thick (c. ¼ of spore length). Photobiont chlorococcoid. Spot tests: thallus and apothecia K+ red, C-, KC-, P-. Chemistry: thallus and apothecia with different anthraquinones.
Note: on sunny surfaces of compact calcareous rocks, often on cyanobacterial crusts; this species was frequently confused with Flavoplaca polycarpa. The record from Sicilia, by Ottonello & Salone (1994) is dubious, and that from Venezia Giulia reported by Nimis (1993: 185) refers to F. polycarpa (vidi!).