''Triphragmium ulmariae'' is a species of

rust fungus Rusts are fungal plant pathogens of the order Pucciniales (previously known as Uredinales) causing plant fungal diseases. An estimated 168 rust genera and approximately 7,000 species, more than half of which belong to the genus ''Puccinia'', are ...

in the family

Sphaerophragmiaceae The Sphaerophragmiaceae are a family of rust fungus genera in the order Pucciniales, based on the type genus In biological taxonomy, the type genus (''genus typica'') is the genus which defines a biological family and the root of the family n ...

. It causes meadowsweet rust gall, which develops as a chemically induced swelling, arising from the lower surface of the meadowsweet (''Filipendula ulmaria'') leaves.

Life cycle

The fungus grows in the petioles and midribs of the perennial plant meadowsweet (''Filipendula ulmaria''), a member of the

rose family Rosaceae (), the rose family, is a family of flowering plants that includes 4,828 known species in 91 genera. The name is derived from the type genus ''Rosa''. The family includes herbs, shrubs, and trees. Most species are deciduous, but some ...

, causing swelling and distortion. Sori develop with bright orange spores. The rust's spores reach the new meadowsweet plants via air movements. The rust has a severe effect on the survival of meadowsweet seedlings.

References

{{Taxonbar, from=Q6803444 Pucciniales Galls Fungi described in 1808 Fungus species