Description

 Life habit: lichenized; Thallus: crustose, effuse sometimes slightly bullate, rimose; surface: usually creamy-white, smooth, usually slightly pruinose, soredia often developed; cortex: with anticlinally arranged hyphae; medulla: white, chalky; photobiont: primary one a Trentepohlia, secondary photobiont absent; prothallus: when free-growing byssoid, brown; when contiguous crust-like and black; Ascomata: apothecioid, numerous to absent, solitary, circular in outline, sessile or immersed; disc: exposed, convex or rarely flat, white with a smooth, pruinose layer; thalline exciple: often undulating or strongly undulating, with algae and cortex; proper exciple: a thin parathecium; epithecium: brown with intertwined and branched paraphysoids; hymenium: 50-140 µm thick; paraphysoids: parallel, sparsely branched, hyaline, 1 µm diam.; hypothecium: dark-brown (carbonaceous), not extending down to the substrate; asci: clavate, 70-120 x 15 µm; ascospores: fusiform, curved, hyaline, 3-septate; walls: smooth; Conidiomata: solitary, immersed, dark-brown, 0.1 mm diam; conidia: filiform, curved or semi-circled, hyaline, 10-16 µm long less than 1 µm thick; Secondary metabolites: orcinol depsides; Geography: coastal regions of Mediterranean and subtropical climates; Substrate: on bark or rock.