Leaf Mine
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A leaf mine along the mid-rib of a hawthorn leaf (Crataegus sp), possibly caused by the larva of the moth Phyllonorycter leucographella (Lepidoptera: Gracillariidae). There were quite a lot of these mid-rib leaf mines over several hawthorn bushes.
Photo taken in Whiteknights Park, Reading, UK, on 2013-09-28.