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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ob-: a prefix signifying the opposite of.
obconical: cone-shaped but attached at the narrower end.
obtuse: blunt or rounded at the apex, the converging edges separated by an angle greater than 90°.
orthostichous: arranged in regular vertical rows on a stem or axis.
orthotropic: mode of growth of vertical branches or leading shoots, especially in conifers where lateral (plagiotropic) branches may have different morphology.