Fagonia cretica (order Zygophyllales)

Fagraea fragans (order Gentianales)

Fagus orientalis (order Fagales)

Fagus sylvatica (order Fagales)

Falco tinnunculus (order Falconiformes)

Faucaria felina (order Caryophyllales)

Fenestraria rhopalophylla (order Caryophyllales)

Fernandezia robusta (synonymous, order Asparagales)

Ferocactus glaucescens (order Caryophyllales)

Ferula communis (order Apiales)

Festuca arundinacea (order Poales)

Festuca clementei (order Poales)

Festuca gautieri (order Poales)

Festuca hystrix (order Poales)

Ficus carica (order Rosales)

Ficus religiosa (order Rosales)

Ficus pumila (order Rosales)

Ficus superba (order Rosales)

Ficus virgata (order Rosales)

Ficus watkinsiana (order Rosales)

Filicium decipiens (order Sapindales)

Filipendula ulmaria (order Rosales)

Filopaludina martensi (order Sorbeoconcha)

Fissidens asplenioides (order Dicranales)

Fissidens bambergeri (synonymous, order Dicranales)

Fissidens bryoides (order Dicranales)

Fissidens crassipes (order Dicranales)

Fissidens cristatus (synonymous, order Dicranales)

Fissidens dubius (order Dicranales)

Fissidens grandifrons (order Dicranales)

Fissidens incurvus (synonymous, order Dicranales)

Fissidens polyphyllus (order Dicranales)

Fissidens taxifolius (order Dicranales)

Fissidens viridulus (synonymous, order Dicranales)

Flabellia petiolata (order Bryopsidales)

Flavocetraria cucullata (synonymous, order Lecanorales)

Flavocetraria nivalis (synonymous, order Lecanorales)

Flavoparmelia caperata (order Lecanorales)

Flavoparmelia leucoxantha (order Lecanorales)

Flavoparmelia rutidota (order Lecanorales)

Flavoparmelia soredians (order Lecanorales)

Flavoplaca citrina (order Teloschistales)

Flavoplaca navasiana (order Teloschistales)

Flavopunctelia flaventior (order Lecanorales)

Flavopunctelia praesignis (order Lecanorales)

Fockea edulis (order Gentianales)

Fomes fomentarius (order Polyporales)

Fomitopsis pinicola (order Polyporales)

Fontinalis duriaei (synonymous, order Hypnales)

Fontinalis hypnoides (order Hypnales)

Fontinalis tenella (synonymous, order Hypnales)

Foraminella ambigua (synonymous, order Lecanorales)

Forda formicaria (order Hemiptera)

Forda marginata (order Hemiptera)

Forda riccobonii (order Hemiptera)

Forficula auricularia (order Dermaptera)

Formica nigricans (synonymous, order Hymenoptera)

Formica pratensis (order Hymenoptera)

Forsellia affinis (order Lichinales)

Forsskaolea angustifolia (order Rosales)

Forsskaolea tenacissima (order Rosales)

Fossombronia maritima (order Fossombroniales)

Fouquieria fasciculata (order Ericales)

Fragaria vesca (order Rosales)

Frangula alnus (order Rosales)

Frankenia corymbosa (order Caryophyllales)

Frankenia ericifolia (order Caryophyllales)

Frankenia pulverulenta (order Caryophyllales)

Fraxinus angustifolia (order Lamiales)

Fraxinus campestris (synonymous, order Lamiales)

Fraxinus darlingtonii (synonymous, order Lamiales)

Fraxinus greggii (order Lamiales)

Fraxinus ornus (order Lamiales)

Fraxinus pennsylvanica (order Lamiales)

Fraxinus smallii (synonymous, order Lamiales)

Fredolia aretioides (order Caryophyllales)

Frerea indica (order Gentianales)

Freycinetia cumingiana (order Pandanales)

Freycinetia cf. plawanensis (order Pandanales)

Freycinetia multiflora (synonymous, order Pandanales)

Fritillaria boissieri (synonymous, order Liliales)

Fritillaria hispanica (synonymous, order Liliales)

Fritillaria lusitanica (order Liliales)

Frullania dilatata (order Porellales)

Frullania ericoides (order Porellales)

Frullania trinervis (order Porellales)

Fucus serratus (order Fucales)

Fucus spiralis (order Fucales)

Fucus vesiculosus (order Fucales)

Fulgensia desertorum (order Teloschistales)

Fulgensia fulgens (order Teloschistales)

Fulgensia fulgida (order Teloschistales)

Fulgensia poeltii (order Teloschistales)

Fulgensia subbracteata (order Teloschistales)

Fulgora lampetis (order Hemiptera)

Fuligo septica (order Physarales)

Fumana ericoides (order Malvales)

Fumaria capreolata (order Ranunculales)

Fumaria officinalis (order Ranunculales)

Fumaria reuteri (order Ranunculales)

Funaria curviseta (synonymous, order Funariales)

Funaria hygrometrica (order Funariales)

Funaria pulchella (synonymous, order Funariales)

Funariella curviseta (order Funariales)

Fuscopannaria praetermisa (order Peltigerales)