No. 551] RELATIONS IN XENOPARASITISM 679 



lies on its periphery. The remains of root -hairs were 

 looked for but were not found. A well denned endo- 

 dermis with granular contents, a portion of which is 

 starch, limits the cortex on its inner surface. The cen- 

 tral cylinder has relatively wide medullary rays and a 

 large pith containing much starch. Opposite each 



bundle, and about 2 cells inside the endodermis, there is 

 a plate which may be composed of leptome, and which m 

 some favorable material appears to be thickened wall 

 only. 



A root 5 mm. in diameter has essentially the same 

 structure as the smaller one above described. The mam 

 differences lie in the heavier cork and the thicker cor- 

 tex. The plate which lies opposite each nbro-vascular 

 bundle, also, is heavier. The endodermis is noticeably 

 poorer in starch. 



