Géneros de hongos: Jaculispora [2 taxones], Jaffuela [1 taxon], Jafneadelphus [1 taxon], Jahnoporus [2 taxones], Jahnula [2 taxones], Jamesdicksonia [2 taxones], Janetia [2 taxones], Japewia [5 taxones], Jattaea [8 taxones], Jobellisia [11 taxones], Johansonia [9 taxones], Johansoniella [1 taxon], Johnwebsteria [1 taxon], Jola [12 taxones], Julella [15 taxones], Junctospora [2 taxones], Junghuhnia [134 taxones]