I remember when I went to Montreal some years ago in the fall and saw lots of maples, silver especially, and lots and lots of dark splotches on the leaves.
These, however, are examples from right here in Brooklyn. This is Black Tar Spot (Rhytisma acerinum), an ascomycete fungi. It’s cosmetic, not existential.
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This work by Matthew Wills is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 3.0 United States License.
Backyard and Beyond 
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