Gattungen assoziierter Organismen: Uapaca [2 Taxa], Udonga [1 Taxon], Ugni [2 Taxa], Uleomyces [11 Taxa], Ulex [52 Taxa], Ullolitsea [1 Taxon], Ulmus [1242 Taxa], Ulocladium [3 Taxa], Ulothrix [1 Taxon], Ulva [2 Taxa], Umbellularia [1 Taxon], Umbilicaria [2 Taxa], Umbilicus [5 Taxa], Unaspis [6 Taxa], Uncaria [13 Taxa], Uncinia [33 Taxa], Uncinula [8 Taxa], Uncinuliella [7 Taxa], Ungnadia [3 Taxa], Unguiculariopsis [20 Taxa], Unguiculella [4 Taxa], Uniola [9 Taxa], Unona [1 Taxon], Unonopsis [1 Taxon], Urania [1 Taxon], Uraria [14 Taxa], Urceola [7 Taxa], Urceolella [1 Taxon], Urechites [6 Taxa], Uredinophila [24 Taxa], Uredo [67 Taxa], Urelytrum [2 Taxa], Urena [40 Taxa], Urera [7 Taxa], Urginea [22 Taxa], Urochloa [153 Taxa], Urocystis [2 Taxa], Urohendersonia [1 Taxon], Uromyces [141 Taxa], Urospermum [1 Taxon], Urospora [1 Taxon], Urostigma [3 Taxa], Ursus [4 Taxa], Urtica [449 Taxa], Urvillea [26 Taxa], Usnea [27 Taxa], Usteria [1 Taxon], Ustilago [6 Taxa], Ustulina [11 Taxa], Utetheisa [2 Taxa], Utharomyces [4 Taxa], Utricularia [1 Taxon], Uvaria [27 Taxa], Uvariodendron [2 Taxa]