392  Myricacece  of  Eastern  United  States.  { ^pi^msT' 
ing  the  hard  bast.  It  resembles  M.  Caroliniensis  in  the  number  of 
primary  medullary  rays  and  in  having  comparatively  broad  medul- 
lary ray  cells.  It  differs  from  both  parents  by  having  larger  in- 
tercellular air-spaces  in  the  cortex,  more  crystals  of  calcium  oxalate 
in  both  cortex  and  phloem,  broader  and  more  numerous  sclerenchyme 
elements  in  cortex,  and  narrower  tracheae.  The  primary  medullary 
rays  are  1-6,  occasionally  1-7,  rows  of  cells  in  width. 
Stem  (gross  structure). — A  shrub  rising  to  a  height  of  2  to 
2.5  metres,  with  very  crooked  branches,  the  younger  of  which  fre- 
quently appear  stunted  in  habit.  The  shoots  of  the  first  year's 
growth  are  somewhat  intermediate  in  nature  with  those  of  M. 
cerifera  and  M.  Caroliniensis.  They  are  of  a  greenish-  to  reddish- 
brown  color,  more  thin  hairy  than  those  of  M.  cerifera,  somewhat 
less  hairy  than4  those  of  M.  Caroliniensis,  but  showing  numerous 
yellow  and  a  few  orange-red  glandular  hairs.  Upon  them  appear 
the  buds  of  next  season's  leaves  and  flowers.  The  branchlets  of 
two  years'  growth  are  dull  reddish  brown  and  devoid  of  thin 
hairs,  but  possess  a  few  golden-yellow  glands.  Lenticels  are  present 
which  vary  from  0.5  to  0.7  mm.  in  length  and  are  arranged  longi- 
tudinally. Alike  with  similar  branchlets  of  M.  cerifera  and  M. 
Caroliniensis,  staminate  or  pistillate  flowers  are  borne  on  special 
catkin  axes,  which,  in  the  case  of  the  pistillate,  persist  for  a  long 
time  after  the  fruits  have  fallen.  The  writer  observed  these  also 
present  on  stems  of  the  third,  fourth,  and  fifth  year's  growth  at 
Wildwood,  New  Jersey,  January  31,  191 5.  The  older  stems  are 
brownish  gray  to  ash  gray  color  and  have  numerous  circular  to 
oval  somewhat  raised  lenticels  arranged  both  longitudinally  and 
transversely,  and  varying  from  0.5  to  1.5  mm.  in  length.  The 
crooked  underground  stem  creeps  through  the  soil  for  long  distances 
and  gives  off  numerous  branches.  These  send  up  tufts  of  spreading 
suckers  at  different  nodes  which  frequently  serve  to  propagate  the 
species.  These  suckers  grow  downward  and  then  upward  in 
arcuate  fashion.  They  are  of  a  whitish  to  reddish-white  aspect 
when  recently  dug  up. 
Aerial  Stem  (histology) . — The  aerial  stem  of  the  hybrid  resembles 
that  of  M.  cerifera  in  the  following  structure  details:  (a)  A  con- 
tinuous sclerenchyme  zone  in  the  pericycle ;  (£>)  the  tendency  of  the 
phloem  masses  to  become  arched  in  their  outer  portions,  due  to 
the  broadening  out  of  the  medullary  rays  at  their  extremities;  (c) 
the  presence  of  many  bast- fib  res  accompanied  by  crystal  fibres  as 
