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- XanthoparmeliaXanthoparmelia (commonly known as green rock shields or rock-shield lichens) is a genus of
- XanthophyllChemical compounds subclass
- Xanthoria parietinaSpecies of lichen-forming fungus
- XanthorrhoeaGenus of flowering plants
- Xanthorrhoea australisXanthorrhoea australis, the grass tree or austral grasstree, is an Australian plant. It is
- XenomaA xenoma (also known as a 'xenoparasitic complex') is a growth caused by various protists
- XerocomusXerocomus is a genus of poroid fungi related to Boletus. Many mycologists did not original
- XeromphalinaXeromphalina is a genus of fungi in the family Mycenaceae. The genus has a widespread dist
- Xylaria hypoxylonXylaria hypoxylon is a species of bioluminescent fungus in the family Xylariaceae. It is k
- XylariaceaeThe Xylariaceae are a family of mostly small ascomycetous fungi. It is one of the most com
- XylarialesOrder of fungi
- XylographaceaeXylographaceae is a family of lichen-forming fungi in the order Baeomycetales. It contains
- XylonomycetesClass of fungi