FLOWERS OF IMPA TIENS FULVA 179 



XIX. The original suspensor cell divides to form five cells in a 

 line, the lower three subdivide to form the lower part of the embryo, 

 the two micropylar cells elongate to form the suspensor proper. 



XX. The free nucleate stage of the endosperm is followed by a 

 mass of ephemeral cells at the micropylar end of the sac; elsewhere the 

 endosperm is a double peripheral layer of cells which disappear at the 

 maturity of the seed. 



XXL The ovule is surrounded by one mass of tissue which only at 

 the micropylar end is divided into two integuments. 



XXII. After fertilization, degeneration begins in the middle layers 

 of the integument and spreads in both directions. 



XXIII. The dehiscence of the capsule is brought about by the 

 increase in size and turgor of h\T3odermal and epidermal cells, and the 

 separation of the wall along a line of small cells lying originally in line 

 with the septa. 



