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Parmotrema perforatum
A greenish-gray foliose lichen with black, unbranched cillia. Apothecia have a hole in the middle--this gives the lichen its species name and common name, and also distinguishes it from the similar appearing P. michauxianum.
Most commonly on trees. Occasionally on rocks.
I have a tough time identifying lichens, but I'm confident I got this one right. Nonetheless, feel free to correct me (especially if you'll take the time to explain how you ID'd it).
Spotted on Mar 26, 2013
Submitted on Mar 27, 2013
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