Montreal’s maples were frequently spotted like this. I think it’s a tar spot fungus in the Rhytisma genus, mostly harmless but cosmetically challenging.
Oh, Canada
2 responses to “Oh, Canada”
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Norway maple, invasive. I believe Canada’s flag has a red maple, no? Could be sugar, but the flag’s maple is literally red…
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Yup, Norway. Tar spots will hit all sorts of maple species.
The stylized maple leaf on the Canadian flag is described only as a maple leaf — http://www.pch.gc.ca/pgm/ceem-cced/symbl/df6-eng.cfm — a bunch of maple species produce sugar, but it’s the sugar maple that’s most famous, and, I think, the only one commercially tapped.
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Backyard and Beyond 
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