36 



SOUTH INDIAN GRASSES 



All the vascular bundles in the leaves of Aristida setacea have 

 broad sclerenchymatous bands on both the sides. Besides these 

 bands arranged like a girder above and below each bundle, there 



Fig. 53. — Transverse section of the leaf mai gin of Panicum repens. x 180 

 I. Sclerenchyma; 2. stomata ; 3. chlorophyllous layer. 



are on the lower side bands of sclerenchyma. So the sclerenchyma 

 becomes almost continuous on the lower side. 



>^nm 



lilfm* 



Fig. 54. — Transverse section of a part of the leaf of Aristida setacea. x 30. 

 1. Vascular bundle ; 2. sclerenchyma ; 3. motor cells. 



Fig, 55. Transverse section of a portion of the leaf of Aristida setacea. x 120 



I. Motor cells ; 2. stomata ; 3. sclerenchyma ; 4. epidermis ; 5. cutinlayer. 



The sclerenchyma lying on the lower side of the primary 

 bundles are contiguous with the bundle, while those above are 

 separated from the bundle by the chlorophyllous layer. (See fig. 55.) 

 In the case of secondary and tertiary bundles the sclerenchymatous 



