Guilliermond - Atkinson 



90 



Cytoplasm 



whereas the granules persist after the differentiation of the chloro- 

 plasts. He considers that only the chondrioconts correspond to the 

 chondriosomes and the granules are not mitochondria but simply 

 metaplasmic granules. Thus, according to Meves, all the chondrio- 

 somes are transformed into plastids in the mature cells of the 



n 



ffi 



>^i7f:rft 





\/ 



LV::).-:.'^. 



• • I 





Fig. 58. — Elodea canadensis (fig. 57 cont.). I, II, further 

 differentiation, a, plastids; b, chondriosomes changing shape. 

 Ill, in a differentiated cell, a, the chondriome; b, plastids and 

 c, chondriosomes. 



phanerogams and it is those elements considered by most authors 

 to be plastids, which Meves believes are represented by the chon- 

 driosomes, whereas those described by others as chondriosomes 

 have nothing in common with them. 



BowEN (1926-1929) at first adopted the theory of Meves and 

 considered the plastids as corresponding to the chondriosomes of 

 animal cells. In later research he was led to modify his opinion 

 and to admit the existence in the phanerogams of two categories of 



