Life habit: lichenized Thallus: crustose, areolate, without elongated lobes; prothallus: absent surface: gray, verruculose, isidiate isidia: laminal, cylindrical, mostly unbranched cortex: adglutinate hyphae, thick Apothecia: adnate, 0.3-1 mm in diam., lecanorine disc: dark brown or black, flat or slightly concave, epruinose margin: disappearing; thalline margin present, concolorous with thallus; proper margin visible, concolorous with disc parathecium: consisting of radiating hyphae; exciple below hypothecium irregular hyphae epihymenium: golden or brown, K-, H-, 10%N-, cN-, C- hymenium: hyaline, 70-85 µm tall; tip cells not swollen, frequently branched; subhymenium hyaline asci: cylindrical, 8-spored ascospores: hyaline, 2 locules, ellipsoid, 14-15.5 x 7-8.5 µm, isthmus 4-5.5 µm, spore end wall thickened Pycnidia: not observed Spot tests: apothecial margin K-, H-, 10% N-, cN-, C-; thallus K-, H-, 10%N-, cN-, C- Secondary metabolites: parietin and emodin. Substrate and ecology: on bark World distribution: southwestern North America, northern South America, and Mexico Sonoran distribution: Baja California Sur. Notes: Caloplaca wrightii has a distinct whitish gray thallus and the apothecial discs are brown to black. The isidia usually are simple but they may occasionally branch. In C. lagunensis the isidia are more coralloid and the apothecial discs are orange. According to Tucker (this volume) Hasse material from southern California may also prove to be this species.