254 



EMBRYOGENESIS IN PLANTS 



Swamy notes that tricotyledonous nodes are of not infrequent occur- 

 rence in large populations of seedlings of Magnoliaceous plants. 

 Bailey, Nast and Smith (1943) consider that the Degeneriaceae, 



B 



Fig. 62. Embryogeny in primitive dicotyledons 



A-H, Degeneria titiensis (A-G, x 283; H, x 90; after Swamy). J, L, Cercidi- 

 phyUiun japoiiiciim (x 560, after Swamy and Bailey). 



Himantandraceae and Magnoliaceae should properly be regarded as 

 three distinct but closely related families, all presumably being coin- 

 prised within the order Magnoliales. 



In Trochoclcfidron and Tetracentron, Nast and Bailey (1945) have 

 noted that the endosperm constitutes the greater part of the seed, the 



