After seeing Observation MO64287 and the comments therein, I decided to upload some photos of a species that I had identified as P. argena, hopping that some one can tell me if I am right.
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That’s the chemistry indicated in “irish lichens” in the link I gave in the references. The full sentence on the chemistry there is “K+ yellow turning red, C-, KC+ red, P+ orange-red, UV-”.
Is that the correct chemistry? (K+ yellow to red, KC+ red) If so, I’d be fairly confident now. (That’s unusual chemistry — K+y-r indicates norstictic or salazinic acid, and KC+r indicates something like lecanoric acid — I don’t actually know of any lichens off the top of my head that combine those! So if that’s correct, it’s got to be the right id.)
Sorry, let me be more clear — I’m not doubting your report, I just don’t remember what P. argena should be! :)
Created: 2011-03-24 16:48:01 EDT (-0400)
Last modified: 2011-03-24 16:48:03 EDT (-0400)
Viewed: 53 times, last viewed: 2017-06-09 09:00:30 EDT (-0400)