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INTRODUCTION TO EMBRYOLOGY OF ANGIOSPERMS 



B D E 



Fig. 129. Development of endosperm in Impatiens roylei. A, first division of 

 endosperm mother cell, resulting in formation of small micropylar and large chalazal 

 chambers. B, more advanced stage, showing large chalazal chamber and three 

 cells formed by transverse divisions of micropylar chamber. C, uppermost cell 

 of micropylar chamber has grown into micropyle; zygote nucleus in division. D, 

 haustorium has penetrated beyond tip of inner integument. Note two-celled 

 embryo and laying down of walls in second endosperm cell from above. E, further 

 growth of micropylar haustorium. F, upper part of ovule, showing hypha-like 

 ramifications of haustorium and their penetration into tissues of funiculus. {After 

 Dahlgren, 1934b.) 



