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- Cortinarius ignellus
- Cortinarius ignotus
- Cortinarius illibatus
- Cortinarius illuminus
- Cortinarius immixtus
- Cortinarius impennis
- Cortinarius incisus
- Cortinarius infernalis
- Cortinarius infractus
- Cortinarius insignitus – France
- Cortinarius integerrimus – France
- Cortinarius intempestivus – France
- Cortinarius inusitatus – Spain
- Cortinarius iodes
- Cortinarius iodioides
- Cortinarius ionema – USA (Washington)
- Cortinarius ionodactylus
- Cortinarius ionomataius
- Cortinarius ionophyllus
- Cortinarius iringa – New Zealand
- Cortinarius isabellae – France
Read more about this topic: List Of Cortinarius Species