﻿> 
  

  

  1890.] 
  

  

  BOTANIC 
  AI. 
  GAZETTE. 
  

  

  167 
  

  

  Although 
  the 
  spots 
  are 
  not 
  very 
  distinct 
  on 
  the 
  upper 
  side 
  

   of 
  the 
  leaf, 
  except 
  in 
  cases 
  where 
  the 
  hvphee 
  areepiphyllous, 
  

   or 
  the 
  spots 
  are 
  quite 
  old, 
  the 
  presence 
  "'of 
  the 
  fungus 
  is 
  eas- 
  

   ily 
  detected 
  in 
  passing 
  along 
  by 
  the 
  plants, 
  for 
  the 
  leaf 
  is 
  

   quite 
  translucent 
  in 
  the 
  diseased 
  places, 
  so 
  that 
  the 
  irregular 
  

   angular 
  areas 
  present 
  a 
  very 
  light 
  vellowish 
  green 
  color 
  in 
  

  

  distinction 
  from 
  the 
  darker 
  green 
  of 
  the 
  healthv 
  portions 
  of 
  

   the 
  leaf 
  " 
  

  

  ria 
  serotina 
  E. 
  & 
  E 
  

  

  Ramiila 
  

  

  (N. 
  A. 
  F. 
  2463), 
  and 
  R. 
  .... 
  

  

  ihum 
  (W. 
  A. 
  F. 
  2291), 
  as 
  well 
  as 
  one 
  can 
  judge 
  from 
  those 
  

   in 
  the 
  dried 
  state, 
  though 
  the 
  spots 
  on 
  the 
  cotton 
  leaf 
  are 
  not 
  

   so 
  plainly 
  visible 
  above 
  when 
  the 
  leaf 
  is 
  dry. 
  The 
  spots 
  of 
  

   ^- 
  areola 
  are 
  also 
  larger 
  and 
  more 
  definitelv 
  angular. 
  The 
  

  

  k'^ 
  

  

  onidia 
  and 
  hyphte 
  differ 
  from 
  those 
  of 
  R. 
  serotina 
  in 
  being 
  

  

  f;°f 
  g^^^^-^tely 
  stouter 
  ; 
  from 
  R 
  ^ 
  , 
  . 
  ^ 
  

  

  bein 
  ^"^ 
  Everhart 
  say 
  pertains 
  to 
  Cercospora,' 
  also 
  in 
  

  

  timef 
  ^^^^^^^' 
  ^^^ 
  the 
  conidia 
  not 
  so 
  

  

  ^^ 
  are 
  in 
  that 
  species. 
  

   / 
  he 
  conidia 
  are 
  deve 
  

  

  long 
  

  

  as 
  they 
  some 
  

  

  undist 
  K 
  " 
  ""^ 
  »-ieveloped 
  in 
  great 
  profusion 
  and 
  in 
  an 
  

  

  thg 
  un^M^^ 
  condition 
  give 
  to 
  the 
  under 
  side 
  of 
  the 
  leaf, 
  to 
  

   down 
  f 
  '. 
  ^y^-> 
  t^^6 
  appearance 
  which 
  certain 
  species 
  of 
  the 
  

   tion 
  ^^■^ 
  .^^'^^ 
  S^^'^ 
  to 
  their 
  hosts, 
  and 
  before 
  an 
  examina- 
  

  

  In 
  ^th 
  ^^"^ 
  ^ 
  anticipated 
  a 
  Peronospora. 
  

   quite 
  -f 
  early 
  development 
  of 
  the 
  conidia 
  the 
  nvpnag 
  are 
  

   ___^iormly 
  short 
  and 
  the 
  conidia 
  concatenate'. 
  As 
  the 
  

  

  ">»! 
  Of 
  Mycology. 
  Vol. 
  V.. 
  

  

  no. 
  2, 
  p. 
  69. 
  

  

  