primary microp. 3 
and prim, cha. ee 
laz. nucleus 
first divis. in -._ 
germin. spore 
megaspores -—— 
daughter cells 
Type A 
“row of four“ 
embryosac-mo- 
therce}] 
1 in ue oe B 
“row of three“ 
‘---=- type © 
“row of two* 
‘)..-—-— Type D 
Fig. 3. Megaspore formation. 
