Gattungen assoziierter Organismen: Xanthium [352 Taxa], Xanthoceras [1 Taxon], Xanthogalum [2 Taxa], Xanthoparmelia [1 Taxon], Xanthophyllum [9 Taxa], Xanthoria [58 Taxa], Xanthoriicola [4 Taxa], Xanthorrhoea [5 Taxa], Xanthosoma [86 Taxa], Xanthoxalis [17 Taxa], Xantolis [1 Taxon], Xenodochus [1 Taxon], Xenosporium [65 Taxa], Xenostigme [3 Taxa], Xenostomella [2 Taxa], Xeranthemum [51 Taxa], Xerapetalis [1 Taxon], Xerocomus [1 Taxon], Xeromphalina [2 Taxa], Xeromphis [7 Taxa], Xerophyllum [2 Taxa], Xerophyta [2 Taxa], Ximenia [31 Taxa], Xolisma [1 Taxon], Xylaria [52 Taxa], Xylia [7 Taxa], Xylobolus [3 Taxa], Xylocarpus [8 Taxa], Xylogramma [1 Taxon], Xylopia [179 Taxa], Xylosma [29 Taxa], Xylosphaera [2 Taxa], Xylostroma [2 Taxa], Xylotheca [31 Taxa], Xymalos [61 Taxa], Xyris [2 Taxa], Xystozukalia [9 Taxa]