Nash, T.H., Ryan, B.D., Gries, C., Bungartz, F., (eds.) 2007. Lichen Flora of the Greater Sonoran Desert Region. Vol 3.
Life habit: lichenized Thallus: present, crustose, areolate, margin thinning at edge, slightly lobed or notched, with elongated lobes, 0.3-0.4 mm long, 0.2-0.3 mm wide; prothallus: absent surface: yellowish orange, smooth, sorediate soredia: fine, in delimited, laminal, cupuliform soralia cortex: cellular, thickness 20-30 µm, granules absent, medulla dense, without granules Apothecia: absent Pycnidia: not observed Spot tests: Thallus K+ red, H-, 10%N-, cN-, C-; medulla IKI- Secondary metabolites: unidentified anthraquinones. Substrate and ecology: on non-calcareous rocks World distribution: Central America and Caribbean Sonoran distribution: Baja California Sur, western Chihuahua, Sonora, and northern Sinaloa. Notes: Caloplaca cupulifera is species mainly is characterized by the thin, smooth, orange, continuous thallus with crateriform soralia. Apothecia are unknown.