U
- Cortinarius ulematus – Australia (Tasmania)
- Cortinarius uliginosus
- Cortinarius umbonatoides
- Cortinarius umbrinolutescens
- Cortinarius umbrinomammosus – France
- Cortinarius undulatofibrillosus – Czech Republic
- Cortinarius uraceus
- Cortinarius urbicus
- Cortinarius ursus – New Zealand
Read more about this topic: List Of Cortinarius Species