20 



Transactions of the Society. 



relatively large size of the nuclei, these phragmospheves are 

 somewhat obscure, but at the same time their identity cannot be 

 questioned.* 



Paired nuclei and phragmospheres have not only been found 

 near the apex of the roots, but also in the cortex of a young stolon 



Fig. l.—Stratiotes aloides L. Lobed nuclei from parenchyma cells 

 of stele of young root, x 535, circa. 



Fig. 2. — Stratiotes aloides L. Young vessel surrounded by parenchyma 

 cells with lobed nuclei from transverse section of a young root. 

 X 535, circa. 



and the mesophyll of a young leaf. Owing to the larger size of 

 the cells, the phragmospheres here attain to a more typical develop- 

 ment than in the case of the roots. 



Further work has shown that the bilobing of the root nuclei is 

 more widespread than was believed when the previous paper was 

 written ; it occurs not only in young roots, but in roots of all ages, 

 being found, for instance, from base to apex in a root 73 cm. long, 



• Beer, R. and Arber, A. (1919), PI. I, fig. 29. 



