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Description

 Thallus: foliose to subfruticose, forming small to medium-sized rosettes up to 3 cm wide or extensive colonies, loosely adnate, lobate; lobes: dorsiventral, flattened to concave or irregular, 0.4-1 mm wide; tips: rotund, 0.1-0.4 mm wide; upper surface: yellow to orange, smooth to shiny, often wrinkled, sorediate; soredia: granular, blastidious, in marginal to submarginal soralia or at lobe tips; medulla: white, reticulate, with short hyphae; lower surface: white, smooth to somewhat wrinkled, often with white rhizines; Apothecia: very rare, laminal, stipitate, up to 3.5 mm in diam.; margin: smooth but often sorediate; disc: orange; epihymenium: brown, c. 10 µm thick; hymenium: hyaline below, 70-90 µm tall; paraphyses: simple or rarely branched, cylindrical, septate; hypothecium: hyaline to pale brown, 25-40 µm thick; asci: clavate, 8-spored; ascospores: ellipsoid, polarilocular, hyaline, 16-17 x 7-9 µm; septum: 6-7 µm wide; Pycnidia: common, immersed to protruding, darker than upper surface; conidia: variable within the pycnidium, 3-4 x 1-1.5 µm; Spot tests: upper surface K+ purple, C-, KC-, P-; Secondary metabolites: parietin (major), fallacinal, emodin, teloschistin and parietinic acid.; Habitat and ecology: on bark, rarely on detritus, rock, or soil, often in humid microclimates; World distribution: western North America; Sonoran distribution: coastal regions of southern California.; Notes: Xanthomendoza oregana somewhat resembles X. ulophyllodes, but its lobes are more irregular, wrinkled and slightly narrower. Soralia are not as frequent in X. ulophyllodes, and never becomes laminal in X. oregana. When pycnidia are present, the conidia contained in them is a mixture of ellipsoid and bacilliform shapes (Lindblom 1997), a character that separates X. oregana from all other taxa in Xanthoria and Xanthomendoza. Compared to Xanthoria candelaria, X. oregana has broader lobes, which are more adnate, as well as different rhizines and conidia. See also notes for X. fulva for comparison with that taxon 

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© Lichen Unlimited: Arizona State University, Tempe.

Source: Lichen Flora of the Greater Sonoran Desert Region

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