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Umbilicaria mammulata
A lichen forming thick sheets on face of rock
Mixed woods
Spotted on Apr 4, 2013
Submitted on Apr 7, 2013
3 Comments
Thank you DrP, I think that is it, lot of unusual lichens in that genus.
Just found some pics of greener U. mammulata (about halfway down the page): http://lichens.digitalmycology.com/macro...
It's some species of Umbilicaria. U. mammulata, smooth rock tripe, is common in your area, but this stuff looks a little too green. In your last picture, you can see that some of the lichen has a more brown upper surface, which is more typical for U. mammulata. You can check out some excellent pics here:
http://www.sharnoffphotos.com/lichensG/u...