birminghamox's picture

Gall on twig

Observed: 13th February 2010 By: birminghamox
S159 Neighbourhood Nature - current student
birminghamox’s reputation in Invertebrates
gallswanpool130210
Description:

large gall on twig on pool margins. Species of tree unknown but possibly oak

Identifications
Species interactions

No interactions present.

Species with which Marble Gall (Andricus kollari) interacts

Comments

petershirley's picture

Marble gall

Yes, this is the agamic generation gall of Andricus kollari, the marble gall.

This is on my local patch, a lot of the oaks in the Sandwell Valley are Quercus X rosacea, the hybrid between Q. robur (English or pedunculate oak) and Q. petraea (sessile oak).

Peter Shirley