HISTOLOGY 



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cells of the ground tissue lying just inside the vascular bundles 

 are all very much thickened. (See figs. 33 and 34.) 



The stems of Panicum Isachne a nd Eragrostis iuterrupta are hollow. 

 The stem of the former is circular in outline in cross section, 

 though wavy. There is a sclerenchymatous ring close to the 



Fig. 36.— Transverse section of the stem 

 of Eragrostis interrupta. x 25 



Fig. 37.— Transverse section of the 

 stem of Panicum flavidum. x 15 



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Fig. 38.— Transverse section of a portion of the stem of Panicum flavidum. 

 I. Epidermis ; 2. sclerenchyma ; 3. vascular bundle. 



70 



epidermis but separated from it by a few layers of parenchyma. 

 One set of bundles is imbedded in the band, and another set 

 just touches the inner border of it. A third series is disposed 

 around a fairly large amount of ground tissue, which may or may 

 not have a cavity in the centre. The stem of Eragrostis 



