﻿14 
  BOTANICAL 
  GAZETTE. 
  [January, 
  

  

  led 
  on 
  the 
  leaves, 
  or 
  a 
  liquid 
  sprayed 
  upon 
  them 
  would 
  here 
  

   be 
  ineffective, 
  for 
  the 
  moisture 
  would 
  soon 
  remove 
  them, 
  

   leaving 
  the 
  fungus 
  free 
  to 
  grow\ 
  If, 
  however, 
  the 
  fungus 
  

   were 
  present 
  at 
  the 
  time 
  of 
  the 
  application 
  of 
  the 
  remedy, 
  

   that 
  part 
  of 
  it 
  growing 
  outside 
  of 
  the 
  leaf 
  might 
  be 
  killed, 
  

   although 
  that 
  would 
  not 
  prevent 
  the 
  mycelium 
  within 
  the 
  

   leaf 
  from 
  continuing 
  to 
  grow. 
  

  

  I 
  have, 
  however, 
  observed 
  that 
  plants 
  growing 
  under 
  the 
  

   shelter 
  of 
  the 
  oleander 
  hedges 
  are 
  remarkably 
  exempt 
  from 
  

   the 
  disease. 
  This 
  I 
  attributed 
  at 
  first 
  to 
  the 
  drippings 
  from 
  

   the 
  leaves, 
  which 
  I 
  thought 
  might 
  partake 
  of 
  the 
  acrid 
  char- 
  

   acter 
  of 
  the 
  sap 
  of 
  the 
  oleander. 
  I 
  am 
  inclined 
  to 
  believe, 
  

   however, 
  that 
  it 
  is 
  rather 
  because 
  the 
  lilies 
  under 
  the 
  hedges 
  

   are 
  remarkably 
  free 
  from 
  moisture. 
  In 
  fact, 
  the 
  overhancring 
  

   hedge 
  collects 
  most 
  of 
  the 
  dew, 
  so 
  that 
  the 
  dew 
  drops 
  dcfnot 
  

   readily 
  gather 
  upon 
  the 
  leaves 
  of 
  the 
  lily 
  plants, 
  and 
  thus, 
  

  

  perhaps, 
  no 
  opportunity 
  is 
  given 
  for 
  the 
  growth 
  of 
  the 
  fun- 
  

   gus. 
  

  

  It 
  might, 
  therefore, 
  be 
  found 
  feasible 
  to 
  grow, 
  in 
  alternate 
  

   rows 
  with 
  the 
  Hlies, 
  some 
  other 
  crop, 
  which, 
  being 
  higher 
  

   and 
  having 
  more 
  spreading 
  foliage, 
  should 
  keep 
  off 
  The 
  dew 
  

   A 
  row 
  of 
  stakes 
  with 
  branches 
  wattled 
  among 
  them 
  mifrht 
  

   serve 
  the 
  same 
  purpose 
  and 
  check 
  the 
  virulence, 
  even 
  if 
  it 
  

   did 
  not 
  entirely 
  prevent 
  the 
  recurrence 
  of 
  the 
  disease. 
  

  

  Explanation 
  of 
  Plate 
  L-Fig. 
  1, 
  Upper 
  side 
  of 
  a 
  leaf, 
  with 
  two 
  

   pots 
  upon 
  It 
  showing 
  different 
  stages 
  of 
  the 
  disease; 
  (a) 
  an 
  early, 
  and 
  

  

  1LT.V 
  "^ 
  ''T 
  ^'^- 
  '' 
  ^ 
  ^^^*'°^ 
  ^^^°"g^ 
  ^ 
  diseased 
  spot 
  

  

  when 
  the 
  disease 
  is 
  far 
  advanced. 
  The 
  hyph^ 
  occupy 
  all 
  the 
  tissue 
  in 
  

  

  he 
  diseased 
  area 
  Fig. 
  3, 
  A 
  gonidiophore 
  with 
  it. 
  gonidia, 
  showing 
  the 
  

  

  ^erigmata 
  and 
  the 
  attachment 
  of 
  the 
  gonidia. 
  Fig. 
  4, 
  A 
  serines 
  of 
  bunches 
  

  

  of 
  gonidia 
  on 
  an 
  o 
  d 
  gonidiophore. 
  Fig. 
  5, 
  An 
  organ 
  of 
  attachment. 
  (If! 
  

  

  ter 
  Marshall 
  Ward. 
  Fig. 
  6, 
  Part 
  of 
  a 
  mycelium 
  showing 
  cross 
  branche 
  

  

  assumed 
  by 
  gonidia 
  shortly 
  before 
  germination. 
  Fig. 
  8, 
  A 
  sprouting 
  gon 
  

   B/oIo^/ca^ 
  Ladoraiory, 
  Mass. 
  Insiitzde 
  of 
  Technology, 
  

  

  