Robin's Pincushion

Robin's Pincushion gall, caused by the wasp Diplolepis rosae, on a wild rose on Hutchinson's Bank, 9 August 2011.

I saw quite a few of these on Hutchinson's Bank. I posted a photo of a bright red one earlier, here: Robin's Pincushion Gall. That one was in Riddlesdown Quarry. They aren't rare, but they're the sort of thing you might not notice unless you look.