CASCARA SAGRADA 



417 



FIG. 177. The outer bark and part of the inner bark of Rhamnus Purshianus in 

 transverse, radial-longitudinal, and tangential-longitudinal sections. 



Me, transverse section of inner bark. 

 Mt, tangential-longitudinal section of inner bark. 

 Mr, radial-longitudinal section of inner bark. 

 Sc, transverse section of stone cell area. 

 . St, tangential-longitudinal section of stone cell area. 

 Sr, radial-longitudinal section of stone cell area. 

 He, transverse section of outer layers of cortex. 

 Hr, radial-longitudinal section of outer layers of cortex. 

 Kc, Kt, Kr, transverse tangential-longitudinal and radial longitudinal 

 sections of cork. 

 6, bast fibers. 

 /, crystal fibers. 

 p, parenchyma. 

 e, sieve. 

 sk, stone cells. 

 m, medullary ray cells. 

 c, collenchyma. 



