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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terete: circular or almost so in cross section.
ternate: in groups of three.
testiculate: testicle-like.
tetrad: a group of four.
tetrahedral: having four sides.
tetraploid: having four of the basis sets of chromosomes in a nucleus.
tetrastichous: arranged in four regular vertical rows, but not necessarily decussate.
tomentum: a hairy covering of short closely matted hairs. adj. tomentose.
tracheid: an elongated closed cell of wood having secondary thickening and conducting water.
trans-lacunar diaphragm: a plate two or three cells in thickness, perforated by pores, in the leaves of Isoetes.
trichome: an epidermal outgrowth, e.g. a hair (branched or unbranched), a papilla.
trilete: of spores, with a three-pronged scar.
trimerous: arranged in whorls of three.
triploid: having three of the basic sets of chromosomes in the nucleus.
triquetrous: triangular in cross section and acutely angled.
truncate: with an abruptly transverse end, as if cut off.
tubercle: a small wart-like outgrowth.
tuberculate: covered with tubercles.