| Noun | 1. | order Marchantiales - liverworts with gametophyte differentiated internallyplant order - the order of plants class Hepaticae, class Hepaticopsida, Hepaticae, Hepaticopsida - liverworts: comprises orders Anthocerotales; Jungermanniales; Marchantiales; Sphaerocarpales family Marchantiaceae, Marchantiaceae - liverworts with prostrate and usually dichotomously branched thalli |