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Graphis glaucescens Fee
Family: Graphidaceae
Graphis glaucescens image
André Aptroot  
Thallus: crustose, cracked to slightly areolate surface: white to pale gray, dull (slightly roughened), mealy/ powdery, without soredia and isidia Apothecia: ± immersed in the thallus, white to pale gray, lirellate lirellae: oblong, branched and flexuous, 0.5-3 x 0.2-0.3 mm disc: narrow, only a grayish slit is visible margin: pale gray with white, mealy cover, entire or with few, indistinct striae exciple: not carbonized, pale yellow at the base, only excipular lips/apices pale brown to carbonized, sometimes slightly striate, lips usually with thin thalline cover of hyaline hyphae epihymenium: poorly developed, usually indistinct, pale yellow, up to 3 µm thick hymenium: hyaline, not inspersed, 100-130 µm tall; paraphyses: 1.5-2 µm thick, tips hyaline to pale yellow; subhymenium: hyaline, 10-15 µm thick asci: clavate, 110 x 20 µm, 8-spored ascospores: hyaline, transversely septate, 8-12-locular, 30-45 x 7-10 µm, I+ blue-violet Pycnidia and conidia: not found Spot tests: cortex and medulla K-, C-, KC-, P- Secondary metabolites: none detected. Substrate and ecology: on bark (Ipomaea) World distribution: pantropical Sonoran distribution: tropical deciduous forest of Sinaloa.