Caloplaca catalinae: H. Magn., Bot. Notiser 1944. 71 (1944). Life habit: lichenized Thallus: little or none, crustose, without elongated lobes; prothallus: absent surface: gray; without asexual propagules cortex: absent Apothecia: adnate, 0.3-0.7 mm in diam., lecideine disc: dark reddish orange, flat, epruinose margin: persistent, slightly raised; thalline margin absent; proper margin visible, concolorous with disc parathecium: irregular hyphae, exciple below hypothecium irregular hyphae epihymenium: golden, K+ red, C+ red hymenium: hyaline, 60-70 µm tall paraphyses: 1-2 tip cells slightly swollen, not branched; subhymenium hyaline asci: cylindrical, 8-spored ascospores: hyaline, 2 locules, ellipsoid, 11-12.5 x 5.5 µm, isthmus c. 4 µm, spore end wall thin Pycnidia: not observed Secondary metabolites: unidentified anthraquinones. Substrate and ecology: on wood World distribution: known only from Catalina Isl., California Sonoran distribution: southern California. Notes: Caloplaca catalinae is very similar to C. ferruginea but the spores in C. catalinae are slightly smaller. It remains to be seen whether these two species are distinct.