Slideshow image
Physcia sorediosa (Vainio) Lynge
Family: Physciaceae
[Physcia integrata var. sorediosa Vain.]
Physcia sorediosa image
Stephen Sharnoff  
Thallus: orbicular to irregular, up to 5 cm in diam. lobes: up to 2 mm wide, usually broadest near the tips, usually overlapping, eciliate upper surface: whitish gray to gray, shiny or rarely pruinose, ± distinctly white maculate (c. like P. aipolia), sorediate soredia: often granular, in marginal, small and delimited soralia that occasionally becomed capitate upper cortex: paraplectenchymatous medulla: white lower cortex: paraplectenchymatous lower surface: black, with dark gray lobe tips; rhizines: black Apothecia: not seen in the Sonoran material, but elsewhere not common, up to 2 mm diam.; margin: crenulated and sometimes disintegrating into soredia; disc: black, with or without pruina ascospores: brown, 1-septate, Pachysporaria type, 20-26 x 9-11 µm Pycnidia: not common Spot tests: cortex and medulla K+ yellow, C-, KC-, P+ yellow Secondary metabolites: upper cortex with atranorin; medulla with atranorin and zeorin. Substrate and ecology: growing both on rocks or on tree trunks in open situation World distribution: known from South America and East Africa and southeastern Asia Sonoran distribution: not known from the Sonoran Desert proper but may be present as it is recorded from Mexico east of the study area. Notes: The species is closely related and similar to P. erumpens as was discussed under that species.
Physcia sorediosa image
Stephen Sharnoff  
Physcia sorediosa image
Stephen Sharnoff  
Physcia sorediosa image
Stephen Sharnoff  
Physcia sorediosa image
Physcia sorediosa image
Physcia sorediosa image
Physcia sorediosa image
Physcia sorediosa image
Physcia sorediosa image
Physcia sorediosa image
Physcia sorediosa image
Physcia sorediosa image