List of fungi of South Africa – I

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Fungi recorded from South Africa are listed alphabetically. The currently accepted names are added after the original names.

- Genus: Icmadophila Trevis. 1852 (lichen)
- Genus: Ileodictyon Tul. & C. Tul. 1844
- Genus: Imbricaria (Schreb.) Michx. 1803, accepted as Anaptychia Körb., (1848)
- Genus: Inocybe (Fr.) Fr. 1863
- Genus: Irene Theiss., Syd. & P. Syd. 1917, accepted as Asteridiella McAlpine, (1897)
- Genus: Irenina F. Stevens 1927, accepted as Appendiculella Höhn., (1919)
- Genus: Irenopsis F. Stevens 1927
- Genus: Irpex Fr. 1825
- Genus: Isaria Pers. 1794
- Genus: Isariopsis Fresen. 1863, accepted as Ramularia Unger, Exanth. (1833)
- Genus: Isidium Ach. 1794, accepted as Pertusaria DC., in Lamarck & de Candolle, (1805)
- Genus: Isipinga Doidge 1921, accepted as Asterina Lév., (1845)
- Genus: Isothea Fr. 1849
- Genus: Itajahya Möller 1895
- Genus: Ithyphallus Gray 1821, accepted as Mutinus Fr., (1849)