PLATE XLI. 



Fig. 30. Cross section of leaf about one-third of distance fi-om base. 

 X 100. a, top; 6, trichomes; c, palisade parenchyma; d, short chloro- 

 plast-bearing cells; e, branches of vein; /, water-storage tissue; g, mid- 

 vein. 



Fig. 31. Cross section of leaf at base of spine, x 100. a, bast fibers 

 of spine. 



Fig. 32. Cross section of spine, x 100. 



Fig. 33. Cross section of spine. X 400. 



Fig. 34. Cross section of midvein. x 570. 



Fig. 3.5. Mascerated section of bast fibers in spine, x 250. 



