At this time of year many of the sycamores get these black spots on their leaves.
This is a fungus called Rhytisma acerinum or Tar Spot of Sycamore
Now you could say, "Oh dear this tree is infected!" or alternatively, "What a decorative finish to the sycamore year."
It has a negligible impact on the foliage's capacity to photosynthesise, does the tree no harm, so why not enjoy it?
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