Meadowsweet Rust Fungus - Triphragmium ulmariae

The Meadowsweet Rust Fungus Triphragmium ulmariae causes gall on the host plant, Filipendula ulmaria; these is no host plant alternation.  The aecia are orange and mainly on the underside leaf-veins and petioles.  Uredinia are similar, and later on blackish telia are present on leaf undersides.

It may be found by careful observation anywhere that the plant Meadowsweet is present.

The rust's spores reach the Meadowsweet via air movements and are spread from the galls that develop on the petioles and / or midrib veins. The rust has a severe effect on the survival of Meadowsweet seedlings.

Common and widespread in Britain.

Fairly common in Leicestershire and Rutland.