THE FEMALE GAMETOPHYTE 



117 



Most of the antipodal cells soon degenerate, and only a few may be 

 seen in the mature embryo sac (Fig. 75H). 



Fritillaria Type. Following the work of Treub and Mellink 



E F G H 



Fig. 75. Development of embryo sac in Maianthemum bifolium. A, l.s. nucellus, 

 showing megaspore mother cell. B, clyad stage. C, tetrad. D, four-nucleate 

 embryo sac formed by dissolution of walls separating megaspores. E, eight- 

 nucleate stage. F, same, nuclei in prophase of next division. G, embryo sac with 

 16 nuclei. H, mature embryo sac. (After Stenar, 1934) 



(1880) on Lilium bulbiferum, several other investigators, notably 

 Strasburger, Mottier, Guignard, Coulter, and Sargant, studied a 

 number of species of this genus and repeatedly confirmed that the 



