Triphragmium ulmariae
{{Short description|Species of fungus}}
{{Speciesbox
|image=Triphragmium ulmariae, Meadowsweet Rust.jpg
|image_caption=Mature gall on a leaf of meadowsweet (Filipendula ulmaria)
|genus=Triphragmium
|species=ulmariae
|authority=(DC.) Link
|synonyms=Puccinia ulmariae DC. (1808)
}}
Triphragmium ulmariae is a species of rust fungus in the family Sphaerophragmiaceae. It causes meadowsweet rust gall,{{r|bioimages}} which develops as a chemically induced swelling, arising from the lower surface of the meadowsweet (Filipendula ulmaria) leaves.{{r|Stubbs}}
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.{{r|Stubbs}} The rust's spores reach the new meadowsweet plants via air movements.
The rust has a severe effect on the survival of meadowsweet seedlings.