Igto] SMITH—ZAMIA FLORIDANA 135 
3. Development of the female gametophyte and changes in 
the “‘spongy tissue”’ 
Many slides show the uninucleate condition of the embryo sac, 
indicating that this stage is quite prolonged. Fig. 14 shows a few 
cells surrounding the embryo sac, — 
which are broken down by the 
growing sac; material killed August 
29 is about the first to show this 
condition. The nucleus of the 
embryo sac divides as is described 
for other species, and the nuclei take 
the polar position. There is a slight 
indication of cytoplasm forming a 
lining to the wall, but the karyo- 
kinetic figure in the section drawn 
must have formed a little to the 
embryo sac and “spo tissue” (August 29): @, active nutritive cells; 6, tissu 
of closely packed cells; c, flattened cells bounding group. X930. 
Fics. 14, 15.—Fig. 14, detail of enlarging embryo sac. X930;] fig. 15, detail of 
e 
side of the middle of the sac (fig. 15). Fig. 15 shows the sac and 
the surrounding cells on one side as far as the flattened rows (c) 
