Bedeguar Gall

This is a Robin's Pincushion (also known as the 'Bedeguar Gall') it is a gall caused by the larvae of a tiny gall wasp, (Dipoloepis rosae).

It is said to be widespread and common although this is only the second one I have found. It develops on the stems of wild roses, the colour becomes more red as it matures in autumn. The grubs inside the gall feed on the host plant throughout the winter and emerge in spring as adults.