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DescriptionLife habit: lichenized; Thallus: crustose, elongate lobed, margin abrupt at edge, with elongated lobes 1-2 mm long, 0.3-1 mm wide; prothallus: absent; surface: orange, smooth, without asexual propagules; cortex: cellular, 15-50 µm thick, granules absent, medulla prosoplectenchymatous or dense, without granules; Apothecia: immersed or adnate, 0.4-1 mm in diam., lecanorine; disc: orange, flat, epruinose; margin: persistent, flush or slightly raised; thalline margin present, concolorous with thallus; proper margin not visible or visible, concolorous with disc; parathecium: cellular (paraplectenchymatous); exciple below hypothecium amorphous; epihymenium: golden, K+ red, H-, 10%N-, cN-, C-; hymenium: hyaline, 70-85 µm tall; paraphyses: 2-3 tip cells swollen, not branched; subhymenium hyaline; asci: cylindrical, 8-spored; ascospores: hyaline, 2 locules, ellipsoid, 11-14 x 5.5-7 µm, isthmus 2-4 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 or calcareous rocks; World distribution: worldwide; Sonoran distribution: southern California, Arizona, Baja California, and Baja California Sur.; Notes: Caloplaca saxicola has a small thallus with short lobes that sometimes look inflated with apothecia developing near tips of lobes. It is similar to C. ignea and C. impolita but they have larger thalli with apothecia developing near the center of the thallus.