Chapter X 



95— Duality of the Chondriome 



remnant of the elaborating chondriocont. When the starch is util- 

 ized, its absorption takes place within the amyloplast. The grain 

 diminishes in volume while the outer mitochondrial layer grows 

 and regenerates a chondriocont which will function again later. 



j»r 





• / . o: 





ocrV 





Fig. 61. — Chondriome. A-D, Root of Cucurbita Pepo. 

 A, meristem; a, amyloplasts; a', inactive mitochondria. B, 

 cortical parenchyma; a, starch; b. amyloplasts: b'. inactive 

 mitochondria, in some cases (b") appearing like typical 

 chondrioconts. C. parenchyma of central cylinder; o. 

 starch; c, amyloplasts; c', inactive mitochondria. D, corti- 

 cal parenchyma of hypocotyl; a, compound starch grain in 

 chloroplast, d; d', inactive mitochondria. E, liver of frog. 

 F, basidium of Psalliota campestris. In E and F, the mito- 

 chondria form vesicles of unknown significance. Regaud's 

 method. 



The chondrioconts, therefore, are not destroyed during elaboration 

 and it is always the same elements which function in the formation 

 of starch. Here again there are found the two categories of ele- 

 ments observed in Elodea canadensis and their shape generally 

 makes it possible to follow them separately during their entire 

 development. (Figs. 57, 58). 



