Acrogen

[ækrәdʒin]

(noun.) any flowerless plant such as a fern (pteridophyte) or moss (bryophyte) in which growth occurs only at the tip of the main stem.

Typed by Clyde--From WordNet

(n.) A plant of the highest class of cryptogams, including the ferns, etc. See Cryptogamia.

Typist: Virginia

n. a plant that grows at the top chiefly as a tree-fern.—adj. Acrog′enous.

Checker: Mattie