Fig.  5.  Cross-section  of  rhizome,  magnified  500  diameters  ;  a,  epidermis  ; 
b,  cork  or  periderm  ;  c,  hypoderma  of  collenchyma  ;  d,  cortical  parenchyma  ; 
e,  endodermis  ;  /,  sclerenchymatous  pericycle  ;  g,  phloem  or  bast ;  h,  xylem 
or  wood  ;  i,  parenchyma  of  pith. 
