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