Toothed lobed leaf 20cm long
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Thanks for the rapid ID. I was able to send the students away with a possible ID. Was using an online key to ID leaves students found in the school grounds. This was not on it. Been out after class and got some more pictures if it helps.
Molecular Biologist and Biology Teacher but only an amateur Naturalist.
The university library probably has a copy of Mitchell (Collins' A Field Guide to the Trees of Britain and Northern Europe) or Sterry (Collins Complete British Trees). If you take one of those with you - in this case preferably the former - you can probably puzzle it out.
There are 4 species of red oak - Quercus velutina, Quercus coccinea, Quercus palustris and Quercus rubra (aka Quercus borealis), with a tendency to produce good red autumn colours. Leaf shape is variable, and hence it is difficult to distinguish them by that feature.
The bark in this case seems to match the description of Quercus palustris (in Mitchell) better. Sterry has bark photos, and none is an exact match.
This is actually Red Oak (Q. rubra). Q. palustris and Q. coccinea have smaller glossier leaves. Q. velutina is only likely to be found in a collection.
Lat/Lng: 51.4, -1.0
OS grid ref: SU7273