Bot. [mod. f. Gr. ἄκρο-, see ACRO- + -γενης -born; see -GEN.] A cryptogamous plant of the higher division, including ferns and mosses, so called from having a distinct perennial stem with the growing point at its extremity, in contradistinction to Thallogens, as lichens and fungi, which have no permanent stem, but grow from a central rosette.
1845. Lindley, Sch. Bot., ii. (1858), 22. Acrogens differ essentially from the two other classes, in having no flowers.
1857. H. Miller, Test. Rocks, i. 12. In the Coal Measures … both the Gymnogens and Acrogens are largely developed.
