SEED COAT 469 
phytic tissue in the seeds of Angiosperms comparable to that 
in the seeds of Gymnosperms. The endosperm in the seeds of 
Gymnosperms is simply the portion of the gametophyte that 
Fic. 414. — The life cycle of Angiosperms illustrated by the life cycle of 
Red Clover. At the left in the line above, a branch of Red Clover with 
heads of flowers (X 3); next, a vertical section through a flower, showing the 
floral structures; at the right, a section of an anther, a pollen grain, and a 
pollen grain with tube and male gametophyte developed. At the left in the 
line below, an ovule with female gametophyte mature and pollen tubes en- 
tering through the micropyle; next, embryo and endosperm forming; next, 
seed mature from the embryo of which the new plant at the right develops. 
remains, but in Angiosperms the endosperm develops after the 
gametophyte is formed and from a nucleus formed by the fusion 
of three other nuclei, one of which came from the male gameto- 
phyte. 
