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Micro fungus on Sycamore leaves?

Observed: 17th April 2011 By: s.l.garlicks.l.garlick’s reputation in Invertebratess.l.garlick’s reputation in Invertebrates
Assorted 437
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Description:

Strange pink raised nodules on sycamore leaves on tree. Occurred around a month after the leaves started to appear on the tree. Mainly on the lower leaves of the tree as far as I can see. I have also noticed them on sycamore saplings growing from front garden hedges on Westbourne Avenue in Hull. I have no idea what this may be, and if there is a cause.

Identifications
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No interactions present.