Acorns

Acorns developing on a Sessile Oak, Quercus petraea.  West Wickham Common, 10 September 2011.

It is a very good year for acorns as well as all sorts of other fruits and berries. What's more, the oak trees are unusually healthy and there aren't many of the Knopper galls that often take over the developing acorns.  But anyway, according to Wikipedia, Knoppers grow on Pedunculate Oaks (Quercus robur), and this is a Sessile Oak (Quercus petraea); the acorns do not have stems.  I didn't know about that, and I will check it out with the few Knoppers I have noticed.