- Faerberia carbonaria
- Farysia thuemenii
- Favolaschia calocera
- Fayodia anthracobia
- Fibriciellum silvae-ryae
- Fibricium gloeocystidiatum
- Fibrodontia gossypina
- Fibroporia vaillantii
- Fistulina hepatica
- Flagelloscypha mairei
- Flagelloscypha minutissima
- Flammulaster carpophilus
- Flammulaster ferrugineus
- Flammulaster granulosus
- Flammulaster limulatus
- Flammulaster muricatus
- Flammulaster siparius
- Flammulaster subincarnatus
- Flammulina populicola
- Flammulina velutipes
- Flavoparmelia caperata
- Floccularia luteovirens
- Fomes fomentarius
- Fomitopsis pinicola
- Fulgensia fulgens
- Fuligo cinerea
- Fuligo septica
- Fusarium roseum
- Fuscolachnum pteridis v. pteridis
