Australian Biological Resources Study
Fern definitions mostly compiled by Mary D.Tindale
(definitions of conifer terms provided by K.D.Hill)
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falcate: sickle-shaped.
false veins: rows of thickened cells in a leaf/leaflet which are not part of the vascular system, as in some genera of the Hymenophyllaceae.
fastigiate: with extensive lateral branching and no clear single leading branch.
fenestrate: pierced with small window-like openings.
ferruginous: rust-coloured.
fimbriate: of a margin, fringed with fine hairs.
flabellate: fan-shaped.
floccose: covered with soft tangled woolly hairs.
Florin ring: a distinct raised ring around stomatal openings of Podocarpus, formed by raised subsidiary cells that are differentiated from other epidermal cells.
frond: the whole leaf of a fern or cycad, including the lamina and the stipe or petiole.
fugacious: shed or withering away very early.
fuscous: dusky.