We have a Silver Maple tree outside our kitchen window. I'd guess it was planted about the same time as the house was built (i.e. more than 80 years ago) and it's definitely beginning to show its age. It's dropping branches -- sometimes quite large branches -- with mildly alarming regularity now, and its canopy shows more and more balding patches among the leafy arms. But the trunk is still thick and strong and covered with a burgeoning blanket of lichens.
When I see lichens, I always think "good air quality" as I learned in intro Biology class all those years ago.
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