Triphragmium ulmariae

Triphragmium ulmariae is a species of rust fungus in the family Sphaerophragmiaceae. It causes meadowsweet rust gall,^[2] which develops as a chemically induced swelling, arising from the lower surface of the meadowsweet (Filipendula ulmaria) leaves.^[3]

Triphragmium ulmariae
Mature gall on a leaf of meadowsweet (Filipendula ulmaria)
Scientific classification
Kingdom:	Fungi
Division:	Basidiomycota
Class:	Pucciniomycetes
Order:	Pucciniales
Family:	Sphaerophragmiaceae
Genus:	Triphragmium
Species:	T. ulmariae
Binomial name
Triphragmium ulmariae (DC.) Link
Synonyms[1]
Puccinia ulmariae DC. (1808)

Life cycle

The fungus grows in the petioles and midribs of the perennial plant meadowsweet (Filipendula ulmaria), a member of the rose family, causing swelling and distortion. Sori develop with bright orange spores.^[3] The rust's spores reach the new meadowsweet plants via air movements.

The rust has a severe effect on the survival of meadowsweet seedlings.