Acrogen

2 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  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]

From WordNet (r) 2.0 [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