THE ENDOSPERM 



235 



J I H 



Fig. 130. Development of endosperm in Ruellia. A, R. solitaria, embryo sac 

 showing fertilized egg and primary endosperm nucleus. B, same, later stage, 

 showing delimitation of chalazal haustorium. C,D, R. squarrosa, micropylar 

 haustorium, chalazal haustorium, and central endosperm chamber. E,F, R. 

 solitaria, increase in number of free nuclei in central chamber. G, R. pulcherrima, 

 similar stage. //, R. decaisniana, micropylar and chalazal haustoria and centra] 

 endosperm chamber with many free nuclei. /, R. solitaria, more advanced stage, 

 showing beginning of wall formation in upper part of central chamber. J, R. 

 pulcherrima, central chamber consisting of upper cellular and lower free nuclear 

 portion. (After Mauritzon, 1934.) 



