Arum Rust - Puccinia sessilis

This rust fungus commonly infects Lords-and-Ladies (Arum maculatum) and Ramsons (Allium ursinum) causing yellow to orange circular patches on leaves. On the underside it produces raised orange aecia commonly covered in spores.

Where the host plants occur.

When the host plants are in leaf.

Widespread and fairly frequent in Britain.

Status in Leicestershire and Rutland not known.