Géneros de organismos asociados: Faba [12 taxones], Fabiana [2 taxones], Fadogia [10 taxones], Fagara [50 taxones], Fagopyrum [55 taxones], Fagraea [8 taxones], Fagus [2458 taxones], Falcaria [217 taxones], Falcipennis [5 taxones], Fallopia [63 taxones], Faramea [17 taxones], Farlowiella [2 taxones], Farsetia [1 taxon], Fatsia [3 taxones], Faurea [16 taxones], Favolaschia [1 taxon], Favolus [5 taxones], Feijoa [21 taxones], Felis [11 taxones], Feltgeniomyces [1 taxon], Fenestraria [1 taxon], Fennellia [7 taxones], Feretia [1 taxon], Feronia [9 taxones], Feronia [1 taxon], Ferraria [3 taxones], Ferrarisia [2 taxones], Ferrisicoccus [2 taxones], Ferula [18 taxones], Ferulago [2 taxones], Festuca [283 taxones], Fevillea [9 taxones], Fezia [1 taxon], Fibigia [4 taxones], Ficaria [93 taxones], Ficus [1328 taxones], Fidicina [2 taxones], Fieldia [3 taxones], Filago [4 taxones], Filicium [3 taxones], Filipendula [160 taxones], Fimbriaria [1 taxon], Fimbristylis [141 taxones], Fingerhuthia [6 taxones], Firmiana [11 taxones], Fischeria [16 taxones], Fissicalyx [2 taxones], Fitzroya [20 taxones], Flabellaria [1 taxon], Flacourtia [41 taxones], Flammulina [2 taxones], Flaveria [2 taxones], Flavobacterium [1 taxon], Flavocetraria [1 taxon], Flavocetrariella [1 taxon], Flavoparmelia [10 taxones], Flemingia [37 taxones], Fleurya [2 taxones], Flindersia [1 taxon], Flotovia [6 taxones], Flourensia [3 taxones], Flueggea [19 taxones], Foeniculum [75 taxones], Fomes [17 taxones], Fomitopsis [6 taxones], Fontanesia [1 taxon], Forchhammeria [2 taxones], Forestiera [5 taxones], Forsteronia [9 taxones], Forsythia [65 taxones], Fortunella [3 taxones], Fothergilla [1 taxon], Foveostroma [2 taxones], Fragaria [406 taxones], Francoa [6 taxones], Francolinus [2 taxones], Frangula [276 taxones], Frankenia [4 taxones], Franklandia [1 taxon], Franseria [1 taxon], Frasera [1 taxon], Fraserula [2 taxones], Fraxinus [1424 taxones], Freesia [20 taxones], Fritillaria [5 taxones], Frullania [1 taxon], Fuchsia [23 taxones], Fucus [13 taxones], Fuirena [36 taxones], Fulgensia [1 taxon], Fuligo [10 taxones], Fulvia [8 taxones], Fumago [8 taxones], Fumaria [14 taxones], Funaria [3 taxones], Funastrum [3 taxones], Funtumia [35 taxones], Furcaspis [2 taxones], Furcraea [31 taxones], Fusariella [2 taxones], Fusarium [231 taxones], Fuscophialis [6 taxones], Fuscoporia [2 taxones], Fusicladium [21 taxones], Fusidium [1 taxon], Fusoma [1 taxon]