IMG_6667a rose problem (Large)

IMG_6667a rose problem (Large)

Observation - IMG_6667a rose problem (Large). Description: This was found in open ground on a dog rose(?). It isn't what I recognise as the gall called robin's pincushion, but is this how it starts?

This was found in open ground on a dog rose(?). It isn't what I recognise as the gall called robin's pincushion, but is this how it starts?