With apologies to Phil for the delay, here are some pictures of the mines of Phyllonorycters on fallen oak leaves to help others planning to search for them.
Another thing to look out for around Oaks are the mines of Zimmermannia (formerly Ectoedemia) longicaudella/atrifrontella. After Dave's prompting, I've been keeping an eye out in Bernwood and have found them wherever I've looked (in the Oxfordshire part of the forest too), so they're probably lurking elsewhere. The mines are formed under the silvery bark of young growth. I've found them on the trunks of young trees (as low as a foot above ground level, and as high as a metre above my head) up to about 10cm in diameter, and the lower branches of older ones (3-6cm diameter). Basically every young tree on the way out from the Oakley Wood car park had some mines when I checked the other day. Unfortunately it seems the two species can't be separated on the basis of their mines, but I might have a go at breeding them.
|Zimmermannia longicaudella/atrifrontella mine|