Caloplaca schoeferi: Poelt, Fedde Repert. 58: 176 (1955). Life habit: lichenized Thallus: little or none, crustose, continuous, without elongated lobes; prothallus: absent surface: gray, smooth, without asexual propagules Apothecia: adnate, 0.3-0.7 mm in diam, lecanorine disc: orange, flat, epruinose margin: persistent, slightly raised; thalline margin absent; proper margin visible, little lighter than disc parathecium: cellular (paraplectenchymatous); exciple below hypothecium amorphous epihymenium: golden, K+ red, C- hymenium: hyaline, 70-80 µm tall paraphyses: 1-2 tip cells slightly swollen, frequently branched; subhymenium hyaline asci: cylindrical, 8-spored ascospores: hyaline, 2 locules, ellipsoid, 10-14 x 6-8.5 µm, isthmus 3.5-5 µm Pycnidia: not observed Spot tests: apothecial margin K+ red, C-; thallus K-, C- Secondary metabolites: unidentified anthraquinones. Substrate and ecology: on bryophytes or detritus World distribution: Europe and North America Sonoran distribution: Arizona. Notes: Caloplaca schoeferi is a muscicolous species known from a single packet in this region that was tentatively identified by Søchting. It has little thallus and yellow orange to orange apothecia with a fairly thick raised proper margin that is C-. Caloplaca tiroliensis is similar but has thin, flush margin and darkened discs.