(biology) a taxonomic group containing one or more orders

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)

hornworts; liverworts having a thalloid gametophyte; in some classification systems included in the class Hepaticopsida

hornworts

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)

hornworts; liverworts having a thalloid gametophyte; in some classification systems included in the class Hepaticopsida

hornworts