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Pedunculate Oak: Dair Ghalida: Quercus Robur.

The 2-8 cms long prominent stalk on which the acorn cup is attached to the branch distinguishes the pedunculate (pedunculatus = stalked) from the sessile (sessilus = without a stalk). There are other differences but they are blurred because the two oaks may cross-pollinate and hybrids occur throughout Ireland. However, there is one definitive way of identifying the Pedunculate, Andrisus QUERCALICIX, is a tiny wasp which lays its eggs in the females flowers of pedunculate oak only. The acorns abort forming weird, contorted, volcano-like gills called knopper galls which were first reported from the botanic gardens in 1991.

 

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