BARKS. 



PLATE LXXXL 



FIG. 91. Powdered Cascara Sagrada Eark ( x 240) 



col, Collenchyma of the cortex. 



cr, Prismatic and rosette crystals. 



fl, Bast fibres. 



I, I', Bast in longitudinal and transverse section. 



pc, p'c', Cortical parenchyma in longitudinal and transverse 



section. 



ph, Phelloderm. 



rm, Medullary rays, tangential section. 

 r'm', The same, transverse section. 

 r"m", The same, radial section. 

 s, s', Cork, in surface view and section. 

 sc, Sclerenchymatous cells. 

 tc, Rows of crystal cells. 



