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acrogen n. 顶生植物 顶生植物 acrogen n 1: any flowerless plant such as a fern (pteridophyte) or moss (bryophyte) in which growth occurs only at the tip of the main stem Acrogen \Ac"ro*gen\, n. [Gr. 'a`kros extreme, high -gen.]
(Bot.) A plant of the highest class of cryptogams, including the ferns, etc. See {Cryptogamia}. [1913 Webster] {The Age of Acrogens} (Geol.), the age of coal plants, or the carboniferous era. [1913 Webster]
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