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Ochrolechia subpallescens Vers.
Family: Ochrolechiaceae
Ochrolechia subpallescens image
Stephen Sharnoff  
Thallus: crustose, thin to moderately thick, verruculose, rarely verrucose verruculae: usually weakly developed surface: yellowish gray to yellowish white, rugose, continuous, epruinose, with a distinct margin, esorediate Apothecia: lecanorine, sessile, broad, 1-3(-4) mm in diam., flat disc: light orange to light orange-yellow or yellowish pink, usually rugose but epruinose, rarely smooth, sometimes with a disc-colored excipular ring adjacent to the disc, but lacking discoid tissue, K-, C+ red, KC-, P- margin: concolorous with thallus, rarely light orange, thick, usually even, prominent, smooth to more frequently rough, K-, C+ red, KC+ red, P- amphithecium: often containing small crystals, radiate; cortex: radiate or not, +differentiated, 20-40 µm thick, inspersed exciple: relatively thin, distinct or not, (15-)30-50(-70) µm; algal layer: forming a conspicuous, complete layer below the hypothecium, often also in the margin just internal to the cortex hymenium: 180-280 µm tall; hypothecium: thick, 70-90 µm asci: 8-spored ascospores: hyaline, simple, ellipsoid, (35-)40-58 x 20-31 µm Pycnidia: not seen Spot tests: thallus cortex K-, C+ red, KC+ red, P-; medulla K-, C-, KC-, P-; all tissues: UV- Secondary metabolites: gyrophoric, lecanoric (+trace) and 4-O-demethylmicrophyllinic (+trace) acids (constant), olivetoric (+60% of specimens seen by Brodo (1991)), and several unidentified fatty acids. Substrate and ecology: on bark of mainly deciduous trees (e.g. Quercus, Rhamnus, Alnus) rarely conifers (e.g. Pseudotsuga), in oak forests from 0-1550 m World distribution: west coast of North America, from the Queen Charlotte Islands to southern California, plus Asia, Brazil and western Australia Sonoran distribution: central to coastal southern California and Arizona. Notes: Ochrolechia subpallescens is distinguished by its production of olivetoric and 4-O-demethylmicrophyllinic acids in most specimens, and by its short hymenium and small spores.
Ochrolechia subpallescens image
Stephen Sharnoff  
Ochrolechia subpallescens image
Stephen Sharnoff  
Ochrolechia subpallescens image
Stephen Sharnoff  
Ochrolechia subpallescens image
Stephen Sharnoff  
Ochrolechia subpallescens image
Ochrolechia subpallescens image
Ochrolechia subpallescens image
Ochrolechia subpallescens image
Ochrolechia subpallescens image
Ochrolechia subpallescens image
Ochrolechia subpallescens image
Ochrolechia subpallescens image
Ochrolechia subpallescens image
Ochrolechia subpallescens image
Ochrolechia subpallescens image
Ochrolechia subpallescens image
Ochrolechia subpallescens image
Ochrolechia subpallescens image
Ochrolechia subpallescens image