Am.  Jour.  Pharm." 
August.  1908. 
Histology  of  Hyoscyamus  Muticus. 
367 
and  form  (Fig.  5,  B  and  ff),  excepting  a  small  central  portion  of 
the  hypocotyl,  which  shows  the  procambium  strands  already  formed. 
The  cells  of  the  embryo  also  contain  oil  and  aleurone,  but  the 
aleurone  grains  are  smaller  than  those  of  the  endosperm. 
TRICHOMES. 
Trichomes  are  found  on  the  stems,  both  surfaces  of  the  leaves 
and  calyces,  and  are  unicellular  or  multicellular,  simple  or  branch- 
FiG.  5. — L,  Embryo  ;  y,  hypocotyl  ;  z,  cotyledon  ;  A,  transverse  section 
through  the  endosperm  ;  B,  portion  of  hypocotyl  in  longitudinal  section  ;  H, 
part  of  cotyledon  ;  C,  testa,  surface  view  ;  N,  crystals  ;  w,  aleurone. 
ing.  The  unicellular  trichomes  are  curved  and  non-glandular,  but 
are  covered  with  fine,  spine-like  projections  (Fig.  j,  x),  while  the 
multicellular  trichomes  are  smooth  and  glandular.  The  simple 
multicellular  trichomes  are  composed  of  a  two  to  five-celled  stalk, 
bearing  a  rounded  unicellular  glandular  head  (Fig.  2,  0  and  /). 
The  branching  trichomes  have  a  large,  multicellular,  four  to  eight- 
celled  stalk  bearing  one  or  more  branches ;  the  main  stalk,  as  well  as 
the  branches,  terminates  in  a  one-celled  glandular  head  (Fig.  3  s). 
