Notes: This observation is for the white thallus, growing on the ruins of an old stone building and nearly completely covering what’s left of one of the walls.
Now that I have seen the pictures, my guess is that the brown apothecia are unrelated, maybe Acarospora?
And my chemistry is K-, C-, KC+ yellow/green, for the KC I first applied K to the thallus with one end of the q-tip and then C with the other to the same spot. Maybe the green is from the algae and the test is more yellow?
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It looks a lot like what the Sonoran Flora calls “Aspicilia simoensis”, but that should be K+y to red, and would definitely be visible (I would think) using the Q-tip test. It has the same chalky-white “ugly” thallus full of pustules breaking up into coarse soredia. But yours also has lots of Lecanora-like apothecia. None of the sorediate Lecanora in the Sonoran Flora seem to match, either, though.
Created: 2012-01-31 21:18:19 CST (-0500)
Last modified: 2012-01-31 21:18:21 CST (-0500)
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