plural noun

Definition of Marchantiales 

: an order of Hepaticae comprising liverworts in which the gametophyte is differentiated internally into ventral storage tissue sometimes enclosing primitive conducting tissue and into a dorsal region of air chambers and in which the sporophyte has a jacket layer that is only one cell thick — see marchantiaceae

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History and Etymology for Marchantiales

New Latin, from Marchantia + -ales

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