Life habit: lichenized Thallus: crustose, elongate lobed, margin abrupt at edge, with elongated lobes 1-1.5 mm long, 0.2-0.4 mm wide; prothallus: absent surface: brown, smooth, sorediate soredia: granular, in delimited, marginal soralia on lobe tips cortex: cellular, 30-40 µm thick, granules absent; medulla prosoplectenchymatous, without granules Apothecia: absent Pycnidia: not observed Spot tests: Thallus K-, H-, 10%N-, cN-, C- Secondary metabolites: none. Substrate and ecology: on non-calcareous rocks World distribution: Europe, southwestern North America Sonoran distribution: Arizona, southern California, Baja California and western Chihuahua. Notes: Caloplaca demissa has a thallus with elongated lobes that may become slightly pruinose and with laminal punctiform soralia. It may at first look like a Koerberia but that has cyanobacteria instead of green algae in the thallus. Apothecia are unknown.