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Xanthoconium separans —> Boletus separans
Xanthoparmelia
 — angustiphylla
 — conspersa
 — delisei
 — loxodes
 — mougeotii
 — plittii
 — pulla
 — stenophylla
 — verruculifera
Xanthoria
 — elegans
 — papillifera —> Rusavskia papillifera
 — parietina
 — sorediata —> Rusavskia sorediata
Xenasma tulasnelloideum —> Phlebiella tulasnelloidea
Xenasmatella ardosiaca —> Phlebiella ardosiaca I
Xenasmatella vaga —> Phlebiella vaga
Xerocomellus cisalpinus —> Xerocomus cisalpinus
Xerocomellus ripariellus —> Xerocomus ripariellus
Xerocomus
 — armeniacus E
 — badius
 — bubalinus —> Hortiboletus bubalinus
 — chrysenteron
 — cisalpinus
 — lanatus —> Xerocomus spadiceus
 — moravicus
 — parasiticus R
 — pascuus —> Xerocomus chrysenteron
 — porosporus
 — pruinatus
 — ripariellus
 — rubellus
 — spadiceus
 — subtomentosus
Xeromphalina
 — brunneola
 — campanella
 — cauticinalis
 — cornui
 — fellea
 — fraxinophila
 — picta
Xerula
 — longipes —> Xerula pudens R
 — melanotricha E
 — pudens R
 — radicata —> Hymenopellis radicata
Xylaria
 — carpophila
 — filiformis
 — hypoxylon
 — longipes
 — oxyacanthae
 — polymorpha
Xylariaceae
Xylariales
Xylobolus frustulatus V
Xylodon
 — brevisetus
 — flaviporus
 — nespori
 — radula
 — rimosissimus
 — sambuci