what is this maple disease?

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masonspring Mason, OH(Zone 6a) Sep 05, 2019

This grows several years on my maple tree. I am in Mason OH, between Cincinnati and Dayton.

Please help identify and how to cure it.

Thanks!

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hcmcdole Powder Springs, GA(Zone 7b) Sep 05, 2019

Looks like lichen and moss which is a good sign of clean air.

http://www.actforlibraries.org/how-lichens-are-indicators-of-air-quality/

https://theecologist.org/2009/oct/13/using-lichen-indicators-air-quality

https://theecologist.org/2009/oct/13/using-lichen-indicators-air-quality

https://www.nps.gov/articles/lichens-and-air-quality.htm

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