Géneros de hongos: Kabatia [12 taxones], Kabatiella [6 taxones], Kabatina [1 taxon], Kalchbrennera [1 taxon], Kalmusia [42 taxones], Kamatella [2 taxones], Kamatia [4 taxones], Kamatomyces [3 taxones], Kameshwaromyces [2 taxones], Kananascus [3 taxones], Karlingia [4 taxones], Karschia [12 taxones], Karstenia [21 taxones], Karstenula [5 taxones], Kavinia [9 taxones], Kawakamia [1 taxon], Kazachstania [1 taxon], Kazulia [2 taxones], Keissleriella [26 taxones], Kellermania [2 taxones], Kellermanniopsis [1 taxon], Kendrickomyces [6 taxones], Keratinomyces [2 taxones], Keratosphaera [1 taxon], Kernella [3 taxones], Kernia [17 taxones], Kerniomyces [1 taxon], Kernkampella [1 taxon], Ketubakia [1 taxon], Khuskia [296 taxones], Kickxella [2 taxones], Kiehlia [2 taxones], Kilikiostroma [2 taxones], Kiliophora [2 taxones], Kionocephala [2 taxones], Kionochaeta [58 taxones], Kirramyces [347 taxones], Kirschsteiniella [1 taxon], Kirschsteiniothelia [33 taxones], Klasterskya [10 taxones], Klebahnia [29 taxones], Kloeckera [5 taxones], Kluyvera [1 taxon], Kluyveromyces [5 taxones], Kmetiopsis [4 taxones], Kneiffia [12 taxones], Knyaria [27 taxones], Kokkalera [1 taxon], Koleroga [11 taxones], Konradia [3 taxones], Koorchaloma [18 taxones], Koorchalomella [3 taxones], Koordersiella [2 taxones], Kordyana [19 taxones], Kordyanella [1 taxon], Korfiella [2 taxones], Korunomyces [4 taxones], Kostermansinda [3 taxones], Kostermansindiopsis [8 taxones], Kramasamuha [3 taxones], Kretzschmaria [199 taxones], Kretzschmariella [10 taxones], Kriegeriella [50 taxones], Krombholzia [3 taxones], Kroswia [4 taxones], Kuehneola [74 taxones], Kuehneromyces [40 taxones], Kulkarniella [1 taxon], Kumanasamuha [3 taxones], Kusanoopsis [1 taxon], Kutilakesa [3 taxones], Kutilakesopsis [2 taxones], Kweilingia [1 taxon], Kylindria [31 taxones]