﻿Bergman: 
  internal 
  stomata 
  in 
  ericaceous 
  fruits 
  219 
  

  

  The 
  assumption 
  that 
  the 
  leaf 
  has 
  reversed 
  its 
  surfaces 
  without 
  

   an 
  actual 
  turning 
  on 
  the 
  axis 
  might 
  apply 
  very 
  well 
  if 
  the 
  epidermis 
  

   of 
  the 
  fruit 
  only 
  were 
  considered. 
  The 
  explanation 
  does 
  not 
  seem 
  

   to 
  apply 
  as 
  well 
  to 
  the 
  endocarp. 
  There 
  is 
  apparently 
  no 
  useful 
  

   purpose 
  which 
  the 
  stomata 
  in 
  the 
  endocarp 
  might 
  serve 
  and 
  to 
  

   assume 
  that 
  they 
  have 
  developed 
  from 
  a 
  stomata-less 
  surface 
  

   without 
  a 
  demand 
  seems 
  absurd. 
  There 
  still 
  remains 
  the 
  possi- 
  

   bility 
  that 
  in 
  the 
  development 
  of 
  the 
  fruit 
  the 
  leaves 
  which 
  enter 
  

   into 
  the 
  formation 
  of 
  the 
  carpels 
  have 
  actually 
  turned 
  on 
  their 
  

   long 
  axis 
  in 
  the 
  process 
  of 
  this 
  transformation. 
  No 
  evidence 
  can 
  

   be 
  submitted 
  to 
  substantiate 
  either 
  of 
  these 
  suggestions. 
  They 
  

   are 
  merely 
  ofTered 
  and 
  left 
  for 
  some 
  anatomist 
  to 
  answer. 
  

  

  Fig. 
  8. 
  A 
  stoma 
  from 
  the 
  pericarp 
  of 
  Crinum 
  with 
  adjacent 
  cells, 
  X 
  190. 
  

   Fig. 
  9. 
  A 
  stoma 
  from 
  the 
  endocarp 
  of 
  cranberry 
  showing 
  a 
  fungus 
  hypha 
  which 
  

   has 
  come 
  through 
  the 
  stoma 
  and 
  branched 
  out 
  in 
  the 
  seed 
  cavity, 
  X 
  240. 
  

  

  As 
  these 
  internal 
  stomata 
  apparently 
  serve 
  no 
  purpose 
  their 
  

   persistence 
  must 
  be 
  regarded 
  as 
  a 
  -hereditary 
  continuation 
  of 
  a 
  

   stomata-producing 
  tendency 
  after 
  the 
  leaf 
  has 
  lost 
  its 
  normal 
  

   form 
  and 
  function. 
  The 
  persistence 
  of 
  stomata 
  in 
  parts 
  where 
  

   they 
  are 
  no 
  longer 
  useful 
  is 
  well 
  known. 
  Other 
  examples 
  of 
  this 
  

   are 
  found 
  in 
  the 
  occurrence 
  of 
  stomata 
  on 
  the 
  axis 
  and 
  scale- 
  

   leaves 
  of 
  underground 
  stems 
  of 
  numerous 
  plants 
  observed 
  by 
  

   Hohnfeldt 
  (2, 
  p. 
  48) 
  and 
  in 
  the 
  persistence 
  of 
  stomata 
  on 
  sub- 
  

  

  eed 
  oreansof 
  manv 
  aquatic 
  plants. 
  Schenk 
  (6) 
  calls 
  attention 
  

  

  me 
  

  

  appear 
  

  

  also 
  

  

  132) 
  

  

  