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North American Lichen Herbaria
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Physcia dimidiata (Arnold) Nyl.  
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Family: Physciaceae
[Parmelia dimidiata (Arnold) Arnold, moreParmelia pulverulenta var. dimidiata Arnold]
Physcia dimidiata image
Stephen Sharnoff  
  • Greater Sonoran Desert
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Nash, T.H., Ryan, B.D., Gries, C., Bungartz, F., (eds.) 2002. Lichen Flora of the Greater Sonoran Desert Region. Vol 1.
Thallus: irregular, sometimes orbicular, up to 3 cm diam., with ± imbricate lobes lobes: up to 3 mm wide but usually narrower, crenulate at tips with minute lobules, eciliate upper surface: brownish gray to gray or cream colored, with a ± prominent pruina (crystals), sorediate soredia: granular, in marginal soralia, less frequent on outer lobes upper cortex: paraplectenchymatous medulla: white lower cortex: prosoplectenchymatous lower surface: whitish to brownish, with pale gray to brownish rhizines Apothecia: rare, not seen in Sonoran material, elsewhere up to 2 mm diam.; disc: white-pruinose ascospores: brown, 1-septate, Physcia-type, 17-23 x 8-12 µm Pycnidia: rare (not seen) Spot tests: upper cortex K+ yellow, C-, KC-, P+ yellow; medulla K-, C-, KC-, P- Secondary metabolite: upper cortex with atranorin. Substrate and ecology: mainly growing on north exposed rocks World distribution: known from Europe, East Africa, South America and SW North America Sonoran distribution: a relatively common species from low to intermediate localities in Arizona, southern California, Baja California, Baja California Sur, Chihuahua and Sonora. Notes: Physcia dimidiata is the sorediate counterpart of P. biziana with a similar dull gray upper surface. Like P. biziana it has a variable cover of the pruina, but seems to be more often densely pruinose. As the pruina consists of calcium oxalate this may be explained by a greater calcium uptake from a more calcium rich substrate.
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Physcia dimidiata
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Physcia dimidiata image
Stephen Sharnoff  
Physcia dimidiata image
Stephen Sharnoff  
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Stephen Sharnoff  
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Stephen Sharnoff  
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Garry Neil  
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Garry Neil  
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Garry Neil  
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Garry Neil  
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Garry Neil  
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Garry Neil  
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Garry Neil  
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This project made possible by National Science Foundation Awards: #1115116, #2001500, #2001394