VEGETABLE POWDERS 



535 



Fig. 198. VIBURNUM OPULUS. 



a. Normal bast fibers. 



b. Inner bark parenchyma with crystals. 



c. Branching bast cells. 



d. Short bast cells. 



e. Parenchyma with larger crystals. 



/. Loose parenchyma of spheroidal cells. 

 g, h. Outer parenchyma. 

 i. Outer cork. 



