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; B. quadrinucleate stage of 

 embryo-sac; x 200; C, nearly mature sac showing above the two synenrids 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: D, 

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

 resulting from first division of upper polar nucleus ; x 280; E. six cells of endosperm 

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

 embryo formed from an inner cell of the endosperm ; x 300.— After Treub.«« 

 220 



