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From: WordNet (r) 2.0

 division Bryophyta
      n : a division of nonflowering plants characterized by rhizoids
          rather than true roots and having little or no organized
          vascular tissue and showing alternation of generations
          between gamete-bearing forms and spore-bearing forms;
          comprises true mosses (Bryopsida) and liverworts
          (Hepaticopsida) and hornworts (Anthoceropsida) [syn: Bryophyta]