ACROGENS
\ˈakɹəd͡ʒənz], \ˈakɹədʒənz], \ˈa_k_ɹ_ə_dʒ_ə_n_z]\
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[Gr.] (Bot.) One of the primary classes of the vegetable kingdom, according to the Natural system, = the Cryptogams of the Linnaean. The term applies literally to those plants whose stems increase by growth at the summit, e.g. tree-ferns, club-mosses, etc., as distinguished from the manner of growth of Exogens and of Endogens.
By Henry Percy Smith
