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Psora cerebriformis W. A. Weber
Family: Psoraceae
Psora cerebriformis image
Stephen Sharnoff  
Squamules: up to 8 mm wide, rounded, adnate and dispersed to adjacent or partly imbricate, weakly concave to weakly or strongly convex upper surface: gray to olivaceous brown, dull, epruinose or partly to entirely pruinose, strongly fissured margin: concolorous with upper side or white, straight, entire or crenulate upper cortex: up to 140 µm thick, composed of thin-walled hyphae with round lumina, containing crystals of lichen substances and calcium oxalate medulla: containing calcium oxalate lower cortex: absent or poorly developed lower surface: white to pale brown Apothecia: up to 2 mm diam., marginal, immarginate even when young, black, epruinose or white pruinose ascospores: ellipsoid, 10-17 x 6-8 µm Pycnidia: laminal, immersed conidia: bacilliform, 5-7 x 1 µm Spot tests: upper cortex K+ yellow, C-, KC-, P+ yellow; medulla K-, C-, KC-, P- Secondary metabolites: atranorin, sometimes trace of norstictic acid. Substrate and ecology: on soil in open habitats at 1740-2130 m World distribution: western North America Sonoran distribution: locally fairly common in northern Arizona.
Psora cerebriformis image
Stephen Sharnoff  
Psora cerebriformis image
Stephen Sharnoff  
Psora cerebriformis image
Stephen Sharnoff  
Psora cerebriformis image
Psora cerebriformis image
Psora cerebriformis image
Psora cerebriformis image
Psora cerebriformis image
Psora cerebriformis image
Psora cerebriformis image
Psora cerebriformis image
Psora cerebriformis image
Psora cerebriformis image
Psora cerebriformis image
Psora cerebriformis image
Psora cerebriformis image
Psora cerebriformis image
Psora cerebriformis image