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WordNet (r) 3.0 (2006) (WordNet)

Bryophyta
n 1: 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) [synonym:
{Bryophyta}, {division Bryophyta}]