﻿248 
  

  

  BOTANICAL 
  GAZETTE. 
  

  

  [ 
  October 
  

  

  the 
  inner 
  side 
  are 
  connected 
  with 
  each 
  other 
  by 
  cross-j 
  

  

  -fibrils 
  

  

  which 
  enclose 
  rows 
  of 
  small 
  pores. 
  On 
  the 
  outer 
  side 
  in 
  the 
  

   apical 
  part 
  of 
  the 
  leaf 
  the 
  fibrils 
  are 
  partially 
  connected 
  by 
  

   delicate, 
  often 
  incomplete, 
  cross-fibrils 
  which 
  only 
  rarely 
  en- 
  

   close 
  one 
  pore, 
  therefore, 
  here 
  especially, 
  the 
  pores 
  only 
  oc- 
  

   cur 
  in 
  the 
  upper, 
  or 
  sometimes 
  in 
  the 
  upper 
  and 
  lower 
  angles 
  

   ot 
  the 
  cells 
  ; 
  in 
  the 
  basal 
  half 
  of 
  the 
  leaf 
  near 
  the 
  mar- 
  

   gins 
  the 
  pores 
  are 
  more 
  numerous, 
  sometimes 
  in 
  interrupted 
  

   rows 
  on 
  the 
  commissures. 
  The 
  pore 
  distribution 
  however 
  is 
  

  

  """ 
  "7?* 
  'iumerotis 
  ov 
  the 
  innu- 
  side 
  0/ 
  the 
  leaf. 
  

   ^ 
  Ihis 
  species 
  must 
  certainly 
  be 
  found 
  also 
  in 
  North 
  Amer- 
  

   ica 
  wherefore 
  I 
  have 
  taken 
  the 
  liberty 
  to 
  draw 
  attention 
  

  

  to 
  It. 
  -^ 
  

  

  , 
  According 
  to 
  my 
  observations 
  hitherto 
  I 
  conclude 
  that, 
  

   N 
  Vi 
  ^UBSECUNDUM 
  group, 
  SO 
  far 
  as 
  the 
  European 
  and 
  

   xNoitii 
  American 
  species 
  are 
  concerned, 
  the 
  number 
  and 
  

   aistribuUon 
  of 
  the 
  pores 
  on 
  the 
  two 
  surf^ices 
  of 
  the 
  leaf 
  must 
  

   oe 
  considered 
  of 
  the 
  highest 
  importance, 
  and 
  deserve 
  to 
  be 
  

   taken 
  into 
  account 
  in 
  distinguishing 
  the 
  several 
  types. 
  But 
  

   uns 
  IS 
  only 
  possible 
  when 
  we 
  employ, 
  in 
  the 
  investigation 
  

   t 
  nf 
  r°''^ 
  °'™'' 
  ^^^ 
  staining 
  process. 
  We 
  shall 
  then 
  find 
  

   o 
  ntPri-S 
  ^""''T 
  occur-either 
  very 
  abundantly 
  only 
  on 
  the 
  

   outer 
  side 
  and 
  very 
  scantily 
  on 
  the 
  inner 
  side 
  (S. 
  subsecundum 
  

  

  ou^nn 
  ^jy^^i^Pl^y^um),— 
  or 
  conversely 
  they 
  are 
  more 
  numer- 
  

   on 
  bnV 
  •^^'""^' 
  ^'^^ 
  ^'^^^ 
  on 
  tl^« 
  obiter 
  (S. 
  crassicladuni),-or 
  

   outer 
  ;. 
  ' 
  ' 
  ^^umerous 
  (S. 
  rufescens),-or 
  on 
  both 
  inner 
  and 
  

   ffaos 
  wWK^' 
  ^^' 
  ?besum),_oron 
  both 
  sides 
  (the 
  membrane- 
  

   i'e 
  arrn 
  A'°"'f^'"'^' 
  ^^cur 
  on 
  the 
  outside 
  being 
  left 
  out 
  ot 
  

   ^ 
  account) 
  without 
  pores 
  (S. 
  Pylaiei). 
  

  

  VII. 
  

  

  a 
  

  

  cymbifolia 
  

  

  'cnTv^^T''^ 
  ""^"^ 
  °^ 
  ^^^ 
  ««^tical 
  cells 
  of 
  the 
  branches 
  saccateiy 
  

   a 
  nesT.^'T"''''''^' 
  '° 
  '^"^ 
  *^^ 
  ^«"^ 
  ^PP^ar 
  set 
  into 
  each 
  other 
  hte 
  

   downw 
  .1"'^"'' 
  '^'''^°^^ 
  t^^ 
  branch 
  cortex 
  in 
  cross-section 
  (*« 
  

   aC 
  nfl^ 
  ^ 
  '""^^ 
  transverse 
  walls 
  being 
  frequently 
  cut 
  throug 
  

   cells 
  of 
  th 
  ""T" 
  '" 
  ^^ 
  '^^'"P^^^^ 
  «f 
  three 
  layers 
  of 
  cells. 
  Hyalme 
  

   chloroi 
  v^f 
  '^""^ 
  ^'"^^^ 
  t^^«« 
  -« 
  wide 
  as 
  in 
  the 
  next 
  group- 
  

   lar 
  TnS 
  rt 
  ''"' 
  '" 
  "'"^^^ 
  ^^^^ion 
  equilateral- 
  to 
  isosceles-triangu- 
  

   he^e^ 
  ee 
  ' 
  ^''^''^ 
  '^^ 
  ^^'^^'^^ 
  o^ 
  the 
  inner 
  side 
  of 
  the 
  leaf 
  an 
  

   base 
  tL 
  u 
  ^^ 
  °^''' 
  "^"^^ 
  ""'^'^'^ 
  \n^\nA^^. 
  Hyaline 
  cells 
  at 
  b^ 
  

   furnish 
  diiT' 
  "W"' 
  '^ 
  *^^y 
  ^^« 
  "°ited 
  to 
  the 
  chiorophyllose 
  cell*- 
  

   rnished 
  internally 
  with 
  comb-fibrils. 
  

  

  • 
  S. 
  Portorieevse 
  Hampe 
  in 
  Linn^a, 
  2., 
  p. 
  .359 
  C^^'^^' 
  

  

  