There are at least 2 lichens in this picture. The grey-green one is
parmelioid, perhaps a Parmotrema? There isn't enough detail to tell.
There don't appear to be any apothecia. The other is yellow-chartreuse
green, and it's all out of focus. I can't tell what that is at all, but
a Xanthoria is possible.

Always try to grab specimens when you can and bring them back. It's much
easier to ID specimens than photographs!

Jim Bennett

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James P. Bennett
Gaylord Nelson Institute for Environmental Studies
University of Wisconsin
445 Henry Mall, Rm 514
Madison, Wisconsin 53706

608-262-5489

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