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Coenogonium luteum (Dicks.) Kalb & Lücking
Family: Coenogoniaceae
[Biatora lutea (Dicks.) Hepp,  more]
Coenogonium luteum image
Stephen Sharnoff  
Thallus: thin, spreading, up to 8 cm in diam., varnish-like, +continuous or cracked-areolate or lacking surface: pale yellowish green to dark olive-green in shaded situations Apothecia: common and conspicuous, sessile, round, 0.42 mm wide, usually scattered, clearly constricted below margin: pale flesh-colored, prominent, entire or flexuous, occasionally with faint pale pruina in older fruits disc: orange-yellow, red-orange to yellow-red, shallowly concave then convex, epruinose exciple: 40-60 µm thick hymenium: hyaline, (45-)60-80(-90) µm tall; paraphyses: 1.5-2.7 µm wide below, 4.5 µm apically ascospores: hyaline, 3-septate, fusiform to fusiform-ellipsoid, (6-)9-11(-14) x 2-3.5(-4) µm Pycnidia: +immersed conidia: ellipsoid, 3-4(-5) x 1.3-1.8 µm Spot tests: all negative Secondary metabolites: none detected. Substrate and ecology: on bark or moss over trees and siliceous rocks and accumulated soil, in humid, shaded sites World distribution: pantropical, extending into suboceanic temperate regions in both hemispheres Sonoran distribution: coastal, southern California, including the Channel Islands.