The Collaborative International Dictionary of English v.0.48:

Acrocarpous \Ac`ro*car"pous\, a. [Gr. ? extreme, highest + ?
   fruit.] (Bot.)
   (a) Having a terminal fructification; having the fruit at the
       end of the stalk.
   (b) Having the fruit stalks at the end of a leafy stem, as in
       certain mosses.
       [1913 Webster]

WordNet (r) 3.0 (2006):

acrocarpous
    adj 1: (of mosses) having the archegonia at the top of the stem
           [ant: pleurocarpous]