whole plant megagametophyte 2011-03-23T11:32:19Z A whole plant in the gametophyte development stage (PO:0028003) that produces only plant egg cells (PO:0020094). Megagametophytes in bryophytes only produce egg cells, but do not develop from megaspores, because there is no heterospory in bryophytes. In some pteridophytes, megagametophytes develop from megaspores. In angiosperms, Gnetum, and Weltwischia, the megagametophyte is greatly reduced. The megagametophyte in angiosperms is an embryo sac. PO:0025279 PO_GIT:318 female gametophyte (exact) megagametofito (Spanish, exact) plant_anatomy rwalls 大配偶体 (Japanese, exact)