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One specimen was positively IDd at UW-Madison. And this name was given. But there might be more similar species – genus Arthonia is not well studied and almost no illustrations exist for most species (Wisconsin has 22 recognised species). And it could be another, similar looking genus too.
I took some risk (big one too – Jason is watching) to tentatively identify this and several similar looking observations as A. punctiformis – see Observation 64151, Observation 64287, Observation 88276. I’m working on collecting as many samples as I can, since Jim Bennett at UW-Madison seems to know this genus pretty well, and I hope he can help bring some clarity to these “white patches of maple” as I call them (most of the hosts are maples, but there could be other species).
a very common specie here
Created: 2012-11-26 18:52:45 PST (-0800)
Last modified: 2012-11-26 18:55:50 PST (-0800)
Viewed: 32 times, last viewed: 2015-01-24 09:40:52 PST (-0800)