Xenasmatella vaga 
Xerocomellus amylosporus 
Xerocomellus atropurpureus 
Xerocomellus chrysenteron 
Xerocomellus truncatus 
Xerocomus ferrugineus 
Xerocomus hortonii 
Xerocomus illudens 
Xeromphalina cauticinalis 
Xeromphalina cauticinalis pubescentipes 
Xeromphalina cornui 
Xeromphalina fulvipes 
Xerula australis 
Xerula radicata 
Xylobolus subpileatus 
Yellow American Blusher 
Yellow Coral Fungus 
Yellow Cortinarius 
Yellow Fieldcap 
Yellow knight 
Yellow Navel 
Yellow stagshorn 
Yellow swamp russula 
Yellow unicorn Entoloma