Urocystis trientalis
- kingdom: Fungi
- phylum: Basidiomycota
- class: Ustilaginomycetes
- order: Urocystidales
- family: Urocystidaceae
- genus: Urocystis
- species: Urocystis trientalis
Lammi
Central Finland- Punkaharju
Southern Ostrobothnia
Finland
Umeå
Västerbotten
Sweden