WordNet (r) 3.0 (2006):

division Chlorophyta
    n 1: large division of chiefly freshwater eukaryotic algae that
         possess chlorophyll a and b, store food as starch, and
         cellulose cell walls; classes Chlorophyceae, Ulvophyceae,
         and Charophyceae; obviously ancestral to land plants [syn:
         Chlorophyta, division Chlorophyta]