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Leaf Spot Fungus

A leaf from a lime tree (Tilia sp) with pale spots.  The above photo shows that upper surface of the leaf, below is the lower surface:

Under the microscope the pale parts are revealed to be masses of fungal hyphae:

I have not (yet) been able to identify the fungus.

Specimen in first 2 photos taken in Whiteknights Park, Reading, UK, on 2014-05-03, that in the 3rd photo taken in the same place on 2014-05-12.

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