DESCRIPTION: A very variable gall  that is caused by a Sawfly.  The gall develops after egg-laying and can develop on one side of the shoot, thus causing a general curving or, it can be spindle-shaped with the shoot remaining straightish.  This latter growth can be up to 15mm long and 5mm wide. DISTRIBUTION: Uncommon throughout (but possibly under-recorded). HABITAT: Found on Creeping Willow.