Fig. 107- — Balanophora elongata. Stages in development of embryo-sac, endosperm, 

 and embryo. A, archegonium-like megasporangium with mother-cell that becomes 

 megaspore directly without, forming tetrad; x 145; i?, quadri nucleate stage of 

 embryo-sac; x 200; C, nearly mature sac showing above the two syuergids and 

 oosphere, just beneath the micropylar polar nucleus, and at opposite end of sac a 

 group of four nuclei, the three antipodals, and the lower polar nucleus; x '280; Z), 

 at upper cud the synergids and egg are disorganizing, just beneath are two cells 

 resulting from first division of upper polar nucleus ; x 2S0 ; £\ six cells of endosperm 

 shown; syuergids and egg still visible at upper end of sac ; x 300; F, two-celled 

 embryo formed from an inner cell of the endosperm ; x 800.— After Tulle. 46 

 220 



