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 Life habit: lichenized; Thallus: squamulose, subsquamulose, without elongated lobes; prothallus: absent; surface: olive-gray, smooth, without asexual propagules; cortex: cellular, 28-77 µm thick, granules absent; medulla without granules; Apothecia: adnate, 0.2-1 mm in diam., lecanorine; disc: orange, flat, epruinose; margin: persistent, slightly raised; thalline margin present, concolorous with thallus; proper margin not visible; parathecium: elongate to oval cells; exciple below hypothecium irregular hyphae; epihymenium: golden, K+ red, H-, 10%N-, cN-, C-; hymenium: hyaline, 55-70 µm tall; paraphyses: 2-3 tip cells slightly swollen, with some branching; subhymenium hyaline; asci: cylindrical, 8-spored; ascospores: hyaline, 2 locules, ellipsoid, 11-14 x 5.5-7 µm, isthmus 3-4 µm, spore end wall thin; Pycnidia: present, totally immersed; Spot tests: apothecial margin K+ violet, H+ violet, 10% N+ violet, cN+ violet, C+ violet; thallus K+ violet, H+ violet, 10%N+ violet, cN+ violet, C+ violet; Secondary metabolites: unidentified anthraquinones and thalloidima green.; Substrate and ecology: on non-calcareous rocks or occasionally on calcareous rocks; World distribution: western North America; Sonoran distribution: Arizona, southern California, Baja California, Baja California Sur, and Sonora.; Notes: Caloplaca pellodella in its typical form is a very distinctive species with its orange apothecia and dark greenish gray squamulose thallus. The thallus margin is usually distinctly squamulose with slightly lobed, convex squamules. Some collections have a poorly developed thallus and might be mistaken for C. sideritis but that species is usually areolate at the thallus margins, has a lighter gray thallus, has fewer elongated thick walled cells in the proper exciple. In addition, C. pellodella has a thick, smooth necral layer on the thallus and a thicker cellular cortex below the colored layer. The shiny appearance of the thallus is due to the smooth necral layer. Caloplaca hueana has a strictly brown thallus and lacks the necral layer on the thallus cortex and the thallus is completely K-. 

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© Lichen Unlimited: Arizona State University, Tempe.

Source: Lichen Flora of the Greater Sonoran Desert Region

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