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Psora icterica (Mont.) Mull. Arg.
Family: Psoraceae
[Biatora icterica Mont.,  more]
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Stephen Sharnoff  
Squamules: up to 5 mm wide, rounded or elongate, adnate and dispersed to adjacent or slightly imbricate, weakly concave to weakly convex upper surface: bright or greenish yellow, sometimes yellowish brown, dull, epruinose or partly pruinose, smooth or sparingly fissured margin: concolorous with upper side, straight or up-turned, entire or crenulate to lobed upper cortex: up to 50-80 µm thick, composed of thin-walled hyphae with round lumina, containing crystals of lichen substances, sometimes also calcium oxalate medulla: containing calcium oxalate, not lichen substances lower cortex: of mainly periclinally oriented hyphae, not containing calcium oxalate lower surface: white to pale brown Apothecia: up to 1.5 mm diam., laminal, immarginate even when young, black or dark brown, epruinose ascospores: ellipsoid, 14-18 x 6-8 µm Pycnidia: laminal, immersed conidia: bacilliform, 7-8 x 1 µm Spot tests: upper cortex and medulla K-, C-, KC-, P- Secondary metabolite: rhizocarpic acid. Substrate and ecology: on soil in open habitats, from deserts to conifer forests, at 540-2290 m World distribution: North and South America Sonoran distribution: fairly common in Arizona, Baja California Sur, Chihuahua and Sonora.
Psora icterica image
Stephen Sharnoff  
Psora icterica image
Stephen Sharnoff  
Psora icterica image
Stephen Sharnoff  
Psora icterica image
Stephen Sharnoff  
Psora icterica image
Stephen Sharnoff  
Psora icterica image
Stephen Sharnoff  
Psora icterica image
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