The leaf mining season's now in full swing but it's getting pretty difficult to find anything new these days. So, I was well pleased finding this one on Saturday during the Scientific Society walk around Cromwell Bottom. It's Small Alder Midget (Phyllonorycter stettinensis) in Common Alder. It's the only Phyllo that mines the upperside of Alder and you can just make out the central crease in this rather contorted example.
Below is the underside of the mine.
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