526 BOTANY AND PHARMACOGNOSY. 



Stem Bark. — In transversely curved pieces, or irregular 

 oblong chips, 1.5 to 6 cm. long, 0.5 to 1.5 cm. in diameter, 0.5 

 to 1.5 mm. thick; outer surface brownish-red or grayish-brown, 

 longitudinally wrinkled, periderm occasionally exfoliated, with 

 occasional grayish patches of foliaceous lichens and numerous 



Fig. 230. Fruiting branch of Viburnum prunifoUum. 



lenticels ; inner surface yellowish- or reddish-brown, longitud- 

 inally striate; fracture short, periderm brownish-red, inner bark 

 with numerous light yellow groups of stone cells ; odor slight ; 

 taste astringent and bitter. 



Root Bark. — Somewhat resembling the stem bark, but 

 smoother externally, without lichens and having fewer lenticels. 



