244 INTRODUCTION TO EMBRYOLOGY OF ANGIOSPERMS 



out of the micropyle, and its hypha-like ramifications extend along 

 the outer surface of the funiculus and placenta, later penetrating 

 even the wall of the ovary. The chalazal haustorium also branches 



A B C 



Fig. 137. Origin and development of secondary haustoria in Centranthera hispida. 

 Primary haustoria, both micropylar and chalazal, are very weakly developed in 

 this plant. (After Krishna Iyengar, 1942.) 



profusely and "sucks" the contents of the integumentary cells, 

 destroying their walls and causing the formation of large lacunae. 

 In addition, the endosperm cells lying nearest to the chalazal haus- 

 torium also increase in size and send out secondary haustoria, so 



