Fruit-dots in Ferns; see [Sorus].
Frustulose, consisting of a chain of similar pieces, or Frustules.
Frutescent, somewhat shrubby; becoming a shrub (Frutex), [39].
Fruticulose, like a small shrub, or Fruticulus. Fruticose, shrubby, [39].
Fugacious, soon falling off or perishing.
Fulcrate, having accessory organs or fulcra, i. e. props.
Fulvous, tawny; dull yellow with gray.
Fungus, Fungi, [172].
Funicle, Funiculus, the stalk of a seed or ovule, [110].
Funnelform, or funnel-shaped, expanding gradually upwards into an open mouth, like a funnel or tunnel, [90].