Rust Fungus - Puccinia urticata

Puccinia urticata is a rust fungus which develops on the stems and leaves of Common (Stinging) Nettle or Small (Annual) Nettle. It often starts as small orange blisters or swellings. Close examination may reveal the pinhead-like fruiting bodies of the fungus.

Anywhere that the host plant grows

The spores may spread to other nettles or to various sedges where the telial stage of the lifecycle continues without causing a gall to form.

Common and widespread in Britain.

Fairly common in Leicestershire and Rutland.