Hypertext Webster Gateway: "Acrogen"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Acrogen \Ac"ro*gen\, n. [Gr. ? extreme, high + -gen.] 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}.
{The Age of Acrogens} (Geol.), the age of coal plants, or the
carboniferous era.
From WordNet (r) 1.7 (wn)
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
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