acrogen
頂生植物
Ac·ro·gen n. Bot. A plant of the highest class of cryptogams, including the ferns, etc. See Cryptogamia.
The Age of Acrogens Geol., the age of coal plants, or the carboniferous era.
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acrogen
n : any flowerless plant such as a fern (pteridophyte) or moss
(bryophyte) in which growth occurs only at the tip of the
main stem