$6o 
North  American  Conifer  ce. 
Am.  Jour.  Pnarna 
October,  1896. 
The  leaves  are  from  y  to  y2  inch  long,  rather  narrower  at  the 
base  than  at  the  apex,  that  is,  somewhat  wedge-shaped,  leathery  and 
minutely  notched  at  the  apex.    The  stomata  occur  chiefly  on  the 
Fig.  48. — Part  of  cross-section  of  stem  of  Abies  Fraseri,  magnified  75  diame- 
ters, a,  periderm  layer ;  b,  layer  beneath,  consisting  of  a  parenchyma  rich  in 
tannin  ;  c,  c\  resin  passages  ;  d,  d/,  large  cells  containing  mucilage  and  traces 
of  tannin  ;  <?,  e' ',  clusters  of  stone  cells  in  outer  bast ;  f,  cambium  zone  ;  g, 
medullary  ray  consisting  of  cells  containing  tannin  ;  7z,  ring  of  growth. 
under  surface  in  two  silvery  bands,  one  on  each  side  of  the  mid-rib. 
There  are  about  seven  rows  of  stomata  in  each  band.    A  few  stom- 
