338 SCIENTIFIC AND APPLIED PHARMACOGNOSY 



FIG. 150, Peruvian rhatany: A, transverse section showing cork (fc), a group of 

 bast fibers (sfc), parenchyma of cortex (p), medullary-ray cells of inner bark 

 (m), cambium (c), tracheae (t), wood fibers (sc), wood parenchyma (hp), 

 medullary rays one cell in width (m). B, an isolated bast fiber. C, a wood 

 fiber with neighboring parenchyma cells which are somewhat elongated 

 and have somewhat thickened, porous walls. D, portion of a trachea. 

 After Mever. 



