This is an alphabetical list of fungal taxa as recorded from South Africa. Currently accepted names have been appended.
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)
Appendiculella is a genus of fungi in the family Meliolaceae. About 70 species are accepted in 2020.
Echidnodes is a genus of fungi in the Asterinaceae family. The relationship of this taxon to other taxa within the class is unknown, and it has not yet been placed with certainty into any order.