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The other one has a thin yellowish thallus visible, I’d say. This one has no visible thallus (all that’s visible is the apothecia). Could be C. arenaria or one of several similar species. According to the photos in Lichens of North America, arenaria has very reddish apothecia. I have no idea if that is typical or required.
Definitive ID requires careful observation of the spores (size and width of septum), paraphyses (number of round inflated cells at the tips in particular), and sometimes details about the rim and exciple (I’m not so clear on all this yet).
Created: 2011-05-20 11:10:57 CEST (+0200)
Last modified: 2011-05-20 11:10:58 CEST (+0200)
Viewed: 23 times, last viewed: 2016-10-21 02:56:42 CEST (+0200)