Taphrina populina

The fungus Taphrina populina causes galls to form on the leaves of various poplar species. The galls take the form of raised, blister like leaf bulges on the upper surface and are concave below with bright orange/yellow erect asci.

Gall

Unless identified by a recognised expert, a photo is required. If the photo doesn't show the key ID features then in the comments box describe the size and identifying characters you have observed.

Galls may be encountered where the host poplar species occur.

Galls may be encountered when the host poplar species are in leaf.

Widespread in Britain.

Status in Leicestershire and Rutland not known.