D E F 



Fig. 59. Development of embryo sac in Fandanus. A, P. ornatus, four-nucleate 

 stage; note enlargement of nucellar cells in chalazal region. B, same, with some 

 nucellar cells incorporated inside embryo sac. C, P. dubius, four-nucleate stage, 

 showing nucellar nuclei entering into embryo sac. D, P. oleiocephalus, embryo sac, 

 showing several nuclei some of which are apparently derived from nucellus. E, 

 same, mature embryo sac, showing two lateral cells and supernumerary polar 

 nuclei. F, P. ornatus, mature embryo sac, showing large number of antipodal 

 cells. (After Fagerlind, 1940.) 



93 



