| 释义 |
acrogen Bot.|ˈækrədʒɛn|
[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.
1845Lindley Sch. Bot. ii. (1858) 22 Acrogens differ essentially from the two other classes, in having no flowers. 1857H. Miller Test. Rocks i. 12 In the Coal Measures..both the Gymnogens and Acrogens are largely developed. |