Word Study
Acrogen
CIDE DICTIONARY
Acrogen, n. [Gr. 'a`kros extreme, high + -gen.].
A plant of the highest class of cryptogams, including the ferns, etc. See Cryptogamia. [1913 Webster]
OXFORD DICTIONARY
Acrogen, n. Bot. any non-flowering plant having a perennial stem with the growing point at its apex, e.g. a fern or moss.
Derivative
acrogenous adj.
Etymology
Gk akron tip + -GEN
For further exploring for "Acrogen" in Webster Dictionary Online