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  • enlarged photo
  • Image author: Ulrich Kirschbaum ©
  • Lecidea fuscoatra, example species. On siliceous rocks (Grauwacke, upper image and sandstone, lower image); common. Thallus areolate-cracked, brown to grey; apothecia black or grey (when pruinose); margins inconspicuous, later disappearing. Thallus K-, C- (or red), KC+ red, Pd-.
  • Central Europe; Germany: Hesse.
  • Original image
  • Website: Lichen images