Life habit: lichenized Thallus: crustose, areolate to elongate lobed, lobes 0.5-1.5 mm long, 0.3-0.5 mm wide; prothallus: absent surface: orange, smooth, isidiate isidia: short, globose to papillate, not branched, laminal cortex: cellular, moderate, 14-30 µm thick, granules absent; medulla paraplectenchymatous, without granules Apothecia: adnate, 0.3-0.5 mm in diam., lecanorine disc: orange, flat, epruinose margin: persistent, flush; thalline margin present, concolorous with thallus; proper margin not visible parathecium: cellular (paraplectenchymatous) including exciple below hypothecium epihymenium: golden, K+ red, H-, 10%N-, cN-, C- hymenium: hyaline, 60-65 µm tall paraphyses: not swollen or 1-2 tip cells slightly swollen, with few branches; subhymenium hyaline asci: cylindrical, 8-spored ascospores: hyaline, 2 locules, ellipsoid, 11-14 x 5.5-7 µm, isthmus 3.5-4 µm, spore end wall thin Pycnidia: present, totally immersed, ostiole orange Spot tests: apothecial margin K+ red, H-, 10% N-, cN-, C-;thallus K+ red, H-, 10%N-, cN-, C-; medulla IKI- Secondary metabolites: parietin, fallacinal, emodin, and teloschistin. Substrate and ecology: on non-calcareous rocks World distribution: Africa, North and South America Sonoran distribution: Arizona, Baja California Sur, western Chihuahua, Sonora, and northern Sinaloa. Notes: Caloplaca brouardii has orange rather narrow flattened lobes with the central portions covered by numerous small papillae. The lobes are closely appressed to the rock. Caloplaca texana has longer lobes that are convex and often somewhat lighter color and pruinose at the tips and the center of the thallus has phyllidia. Caloplaca appressa has longer lobes and no phyllidia or papillae.