On 28/9/08 10:42, in article , "Malcolm
H" wrote:

Please see these pictures:

http://picasaweb.google.co.uk/mphear...OPy2k#slidesho
w/5250999535032005154

We have several oak trees in our neighbourhood, where we have lived for over
30 years, and the first time we have noticed that some ( about 5-10%) of the
fallen acorns have these growths.

Please can anybody explain what they are?

No idea if this IS it but try Googling on Knopper Gall.

--
Sacha
http://www.hillhousenursery.com
South Devon
(new website online)