The single healthy megaspore retained within the megasporangium germinates to form an egg containing female gaemtophyte called______________? August 9, 2021May 11, 2018 by admin The single healthy megaspore retained within the megasporangium germinates to form an egg containing female gaemtophyte called______________? A. Ovule B. Seed C. Fruit D. Embroyo sac