Life habit: lichenized Thallus: little or none, crustose, continuous or areolate, margin thinning at edge, without elongated lobes; prothallus: absent surface: orange or gray, smooth, without asexual propagules cortex: cellular, thin, granules absent; medulla without granules Apothecia: present, adnate, 0.5-0.8 mm, lecanorine disc: reddish brown, flat or convex, epruinose margin: persistent, flush or raised; thalline margin absent; proper margin visible, little lighter than disc parathecium: consisting of radiating hyphae; exciple below hypothecium irregular hyphae epihymenium: golden, K+ red, C- hymenium: hyaline, 70-75(-85) µm tall paraphyses: 1-2 tip cells slightly swollen, with few branches; subhymenium hyaline asci: cylindrical, 8-spored ascospores: hyaline, 2 locules, ellipsoid, (11-)14-17(-19.5) x 5.5-7(-8.5) µm, isthmus 1.53(-4) µm, spore end wall thin Pycnidia: present, totally immersed, ostiole red Spot tests: Thallus K- or K+ red. Secondary metabolites: parietin and xanthorin. Substrate and ecology: on non-calcareous or calcareous rocks World distribution: Oregon south to northern Baja California Sonoran distribution: southern California and Baja California. Notes: Caloplaca luteominia var. bolanderi is similer to var. luteominia except for disc color.