308 BOTANICAL GAZETTE [qay 
Fic. 20.—Longitudinal section of Convoloulus sepium, showing type of 
e. 
Fic. 21.—Eight-nucleate stage of embryo sac. 
PLATE XXVII 
Fic. 22.—Sac showing polyembryonic condition, containing r- and 2-celled 
embryos (a); 1- and 2-celled embryos (0) 
Fic. 23.—Two-celled embryo 
‘ one. 
Fic. 26.—Older embryo with several 1- and 2-celled embryos, accompanied 
by abundant perisperm 
IG. 27.—Young ahuerieal embryo with suspensor of many vacuolate cells. 
spensor. 
Frc. 28.—Older embryo and suspe 
1G. 29.—Advanced embryo of spherical type 
Fic. 30.—Embryo as found in mature seed, showing cotyledons and 
hypocotyl. 
Fic. 31.—Endosperm in Convoloulus lying next to nucellus rather than 
close to embryo. 
Fic. 32.—Sac containing many-celled embryo, showing entrance of pollen 
tube and inflated tip, with no indications of rupturing (a); same view showing 
micropylar end of sac (0). 
