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DescriptionThallus: foliose, forming small cushions up to 9 mm wide or extensive colonies, adnate to loosely adnate, lobate; hymenium: hyaline below, 50-100 µm tall; paraphyses: simple to branched, cylindrical, septate, mostly with oil droplets in the uppermost cells; hypothecium: hyaline to pale brown, 25-55 µm thick; asci: clavate, 8-spored; ascospores: ellipsoid, polarilocular, hyaline, 11-20 x 5-9 µm; septum: 2.5-9 µm wide; Spot tests: upper surface K+ purple, C-, KC-, P-; World distribution: widely distributed mainly in boreal and temperate regions; Sonoran distribution: rare in southern California and Baja California.; Notes: Compared to other small sorediate species in the genus, Xanthomendoza fulva is generally darker orange pigmented. The thallus is smooth and somewhat shiny, and the lobes appear thin and delicate. Pycnidia, when present, are reddish pigmented and large compared to the lobe width, which make them very conspicuous. The thalli often coalesce into extensive colonies. Small thalli of X. oregana sometimes resemble X. fulva, but generally X. oregana is larger with longer and broader lobes, that are lighter orange pigmented, and the conidia vary in shape. See notes for X. galericulata' and X. fallax for comparisons with these taxa.; upper surface: light to dark orange, smooth and shiny; soredia: granular, blastidious, below lobe tips, in submarginal soralia; Pycnidia: rare to abundant, protruding, dark orange to red-orange; Secondary metabolites: parietin (major), fallacinal (major), emodin, teloschistin (major) and parietinic acid.