368 
PLANT STUDIES 
The female gametophyte develops within the embryo- 
sac, and consists at first of seven independent cells, one 
of which is the egg, no archegonium being formed. The 
n 1 
FIG. 328. Development of embryo of shepherd's purse (Capsetta), a Dicotyledon; 
beginning with 7, the youngest stage, and following the sequence to VI, the old- 
est stage, v represents the suspensor, c the cotyledons, s the stem-tip, w the root, 
h the root-cap. Note the root-tip at one end of the axis and the stem-tip at the 
other between the cotyledons. After HANSTEIN. 
egg is in the end of the sac nearest the micropyle, in 
the most convenient position for the entering tube. 
After fertilization has been accomplished and an oospore 
formed, one of the free cells within the embryo-sac be- 
gins to divide and to form the endosperm, embryo and 
endosperm thus developing together until the seed is com- 
pleted. 
