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Psora pseudorussellii

Psora pseudorussellii photo by Mark Zloba

Psora pseudorussellii photo by Mark Zloba

Psora pseudorussellii photo by Bob Klips

Psora pseudorussellii photo by Bob Klips

DIAGNOSTIC FEATURES: Can be recognized by its small, 2-3 mm wide, rounded to irregular more or less thick reddish brown squamules with light colored margins;  thallus more or less clustered, adnate or marginally ascending; medulla white; lower surface white, lacking rhizines; apothecia brown, the disc convex. 

ECOLOGY:  Found on calcareous rocks. 

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