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Psora decipiens (Hedwig) Hoffm.  
Family: Psoraceae
[Biatora decipiens (Hedw.) Fr.,  more]
Psora decipiens image
Stephen Sharnoff  
Squamules: up to 6 mm wide, rounded, adnate and dispersed to adjacent or imbricate, weakly concave to weakly convex upper surface: orange to bright red or rose, dull or shiny, epruinose or partly to entirely pruinose, smooth or sparingly fissured margin: concolorous with upper side or white, straight or slightly up-turned, entire or often weakly crenulate (especially when young) upper cortex: up to 80-120 µm thick, composed of thin-walled hyphae with round lumina, containing crystals of calcium oxalate but no lichen substances medulla: containing crystals of calcium oxalate, sometimes also lichen substances 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 or yellow pruinose ascospores: ellipsoid, 11-18 x 6-8 µm Pycnidia: laminal, immersed conidia: bacilliform, 6-7 x 1 µm Spot tests: upper cortex and medulla K-, C-, KC-, P- Secondary metabolites: none detected or rarely traces of norstictic acid. Substrate and ecology: on more or less calciferous soil and crevices of rock in open habitats, from deserts to conifer forests, up to 1860 m World distribution: Africa, Asia, Australia, Europe and North and South America Sonoran distribution: common in Arizona, California, Baja California, Baja California Sur and Sonora. Notes: Specimens containing hyposalazinic and hypostictic acids occur in Colorado and Utah (plus Europe); these tend to have more rose colored squamules. In the Arctic, specimens with a high concentration of norstictic acid are common. There are other chemical strains in Australia and South Africa.
Psora decipiens image
Troy McMullin  
Psora decipiens image
Stephen Sharnoff  
Psora decipiens image
Stephen Sharnoff  
Psora decipiens image
Stephen Sharnoff  
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