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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echinate: of a spore, spiny.
eglandular: without glands.
elaters: in Equisetum, appendages of the spore which help in dispersal.
eligulate: lacking a ligule.
emarginate: having a broad shallow apical notch.
ensiform: sword-shaped.
entire: having a smooth margin, not dissected or toothed.
epidermis: the outermost layer of cells of an organ, usually only one cell thick. adj. epidermal.
epimatium: expanded ±fleshy seed-bearing bract scale in certain conifers, especially some Podocarpaceae.
epiphyte: a plant growing on (but not parasitic on) another plant.
erose: of a margin, finely and irregularly eroded or incised.
eusporangiate: having sporangia with walls more than one cell thick. cf. leptosporangiate.
excurrent: having the vein extend beyond the apex of a segment as a mucro (q.v.).
exindusiate: lacking an indusium.
exine: outer layer of a spore wall (or second layer, if perine is present). cf. perine.