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sum(score * weight) /
(total weight + 1)
The coloration suggests Punctelia (bluish and not at all yellowish-green), but that could be due to false coloration of the photo (reflected light from a blue sky will often make usnic species look bluish). Punctelia has atranorin (bluish tint, K+y); Flavopunctelia has usnic acid (yellowish- or milky- green tint, K-, KC+y).
Flavopunctelia flaventior: brown to black lower surface, usnic acid + lecanoric acid (cortex K- C- KC+gold, medulla K- C+red KC+red)
Punctelia subrudecta group: pale to brown lower surface, atranorin + lecanoric acid (cortex K+yellow C- KC-, medulla K- C+red KC+red)
Punctelia borreri: dark brown to black lower surface, atranorin + gyrophoric acid (cortex K+y C- KC-, medulla K- C+pink KC+pink)
That’s a lot of work to say it’s probably P. borreri!
Created: 2010-12-05 12:53:48 EST (-0500)
Last modified: 2010-12-05 12:53:51 EST (-0500)
Viewed: 30 times, last viewed: 2016-05-25 15:29:31 EDT (-0400)