In the December 2013 newsletter we published an introduction to galls, including those we had encountered on some of our field trips. This is an update on some that we have come across more recently.
This slightly cashew-shaped gall (above) is Taphrina pruni and it has altered what started out as a sloe. It is caused by a fungus and the common name of Pocket Plum derives from the action of the fungus which destroys the stone and seed leaving an indentation. These were abundant in 2014 along the stretch of sea-wall from the Britannia Inn at Llanmadoc on Gower and down towards Whiteford Point around Grid Ref SS 4466/9416. The gall starts off greenish and ends up shrivelled and blackish - it is closely related to Taphrina alni, the tongue-like gall on alder cones (see last newsletter for photo). It has been a good year for sloes and despite extensive foraging to produce Sloe Jelly, this was the only location at which I noticed it. The sloes were spotted in June - a few months later the sea-wall was breached and the footpath closed.