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; (7, nearly mature sac showing above the two synergids 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 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; 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 300. 

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