Associated organism genera: 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]