Lichens on trees in the yard

Seeing green patches on my trees, I checked with Home Depot if there was something wrong with the trees and if they were infected! I did not get a proper response. I was told to just mulch and wait for it to go away! No product, no solution to treat it, not even sure what was it. So, I let it be for a few years. Then, I found out it was Lichens growing on my trees 🙂 Now, my curiosity was triggered!

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