I04 PLANT ORGANS OR PARTS OF PLANTS. 



or narrow vascular channels, single or in groups of two or 

 four, with spirally thickened or pitted walls. Besides 



Fig. 19. — Powdered Glycyrrhiza. 

 P, Parenchyma; Ph, phelloderm ; M, medullary rays; Sf, stone 

 cells; K, crystal fibres; Gj, vessels; Sb, sieve tubes; HC, keraten- 

 chyma; Kr, crystals; St, starch (Koch). 



these there are rounded bundles of thick-walled wood 

 fibres. 



