122 



THK PLANT CELL. 



Fig. 92. — 1. The Young 



NUCELLTJS OF AN AnOIO- 



SPERM (Lilium). The 

 dark cell is the hypo- 

 dermal terminal cell of 

 the axial row of cells, 

 and is the mother-cell of 

 the embryo-sac (arohe- 

 aporial cell). 



2. The archesporial 

 cell has divided into 

 two — viz., an upper or 

 tapetal cell, and a lower 

 larger cell. 



3. The tapetal cell 

 has divided into three 

 secondary tapetal cells, 

 and the lower one has 

 had a small cell — the 

 cap-cell — split oif from 

 its upper end. The 

 lowest cell, e, is the 

 young embryo-sac. 



4. The cap -cell has 

 divided into two, and 

 the embryo-sac (macro- 

 spore) is enlarging. 



