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|Noun||1.||class Musci - true mosses: bryophytes having leafy rather than thalloid gametophytes: comprises orders Andreaeales; Bryales; Dicranales; Eubryales; Sphagnales|
class - (biology) a taxonomic group containing one or more orders
Bryophyta, division Bryophyta - 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)
Bryales, order Bryales - category used in some classification systems for mosses having the spore case separated from the capsule wall by a hollow intercellular space
Dicranales, order Dicranales - widely distributed order of mosses with erect gametophores and sporophytes at the tips of stems
Eubryales, order Eubryales - mosses with perennial erect gametophores and stems with rows of leaves and drooping capsules