I wonder if anyone can identify this strange excrescence at the base of
a rose bush. It's growing on some stems that were cut down some months
ago. When it is touched with a twig it seems to dissolve.

http://www.mesnil.demon.co.uk/DSC_0853.jpg

Never seen anything like it before! Thanks in advance.

David

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David Rance writing from Le Mesnil Villement, Calvados, France