gametophyte

especially the development in some ferns of a sporophyte from the gametophyte without fertilization

true mosses: bryophytes having leafy rather than thalloid gametophytes: comprises orders Andreaeales

develops in ovule into a female gametophyte

n liverworts with gametophyte differentiated internally

n the female gametophyte produced by the megaspore of a plant that produces both microspore and megaspores