BULLIFORM CELLS. 



21 



9. In the leaves of Panicum plicatum, the bands of bulli- 

 form cells are first on the upper side and then on the lower, and 

 .are found in the grooves. 



FIG. 29. Transverse section of a blade of Panicum plicatum, in which the bulli- 



form cells are alternately above and be 



FIG. 30. Section of a leaf of 

 prinoides, where the bulliform cells are evenly 

 distributed, excepting over the veins. 1 x50. 

 (Duval-Jouve). 



1 x 10. (Duval-Jouve). 



10. In case of Andropogon 

 prinoides, and other species, 

 these cells are of nearly uni- 

 form size, and distributed all 

 along the upper surface, ex- 

 cepting over the veins. 



FIG. 31. Section, through the middle, of a leaf of . 

 ular epidermis and many bulliform cells. 1 x 50- ( 



;wm, showing trreg- 



FIG. 32. Part of a transverse section of a leaf of Trachiipognn polymorphus, showing 

 small epidermal and very large bulliform cells. 1 x 50. (Sudworl h.) 



