A TEXT-BOOK OF BOTANY. 



-D 



FIG. 177. A, transverse section of Phytolacca root, showing the fibrovascular bundles 

 (V, V, V",) which are produced by distinct cambiums (C). The parenchyma contains little 

 starch, and some of the cells (R) show short raphidesof calcium oxalate, many of the crystals 

 being distributed in the section. 



B. Transverse section of Belladonna root which is two or three years old. There is but 

 one cambium zone (C). Most of the parenchyma contains starch (St), the remaining cells 

 containing cryptocrystalline crystals of calcium oxalate. 



K. cork; S, sieve; W. wood fibers and T, tracheae, both of which are strongly lignified in 

 Belladonna root: M. medullary rays. 



