VEGETABLE POWDERS 



485 



Fig. 172. SCOPARIUS. 



a. Epidermal tissue with stomata. 

 6. Trichomes. 

 c. Pollen grains. 



d. Bast fibers. 



e. Hypodermal tissue. 

 /. Spiral ducts. 



g. Annular duct. 



h. Prismatic crystal bearing fiber. 



