﻿^^9°-] 
  BOTANICAL 
  GAZETTE. 
  323 
  

  

  an 
  abundance 
  of 
  Puccinia 
  SftivguJcB 
  DC, 
  a 
  species 
  of 
  rust 
  

   not 
  before 
  recorded 
  in 
  this 
  country. 
  The 
  host, 
  a 
  European 
  

   plant 
  IS 
  as 
  yet 
  only 
  locally 
  known 
  as 
  a 
  pestiferous 
  weed, 
  and 
  

   tJius 
  there 
  are 
  at 
  least 
  two 
  active 
  fungi 
  which 
  probably 
  came 
  

   with 
  It 
  from 
  abroad, 
  and 
  we 
  trust 
  will 
  tend 
  to 
  check 
  its 
  spread 
  

  

  in 
  America. 
  

  

  Perhaps 
  the 
  most 
  interesting 
  of 
  the 
  peronosporaceous 
  finds 
  

  

  M 
  

  

  Peronos-pora 
  Rtihi 
  

  

  a 
  

  

  ^auien 
  near 
  l\ew 
  Brunswick, 
  and 
  afterwards 
  (July 
  ioth-20th) 
  

   m 
  abundance 
  upon 
  Rubus 
  villosus 
  var. 
  humifusus 
  at 
  Cold 
  

   ^pnngs 
  Harbor, 
  Long 
  Island. 
  Upon 
  the 
  downy 
  under 
  sur- 
  

   lace 
  of 
  the 
  black-cap 
  leaves 
  the 
  Peronospora 
  is 
  not 
  conspic- 
  

   uous, 
  m 
  fact, 
  the 
  species 
  was 
  found 
  bv 
  accident 
  while 
  search- 
  

   ing 
  with 
  the 
  microscope 
  for 
  the 
  cause 
  of 
  a 
  peculiar 
  curling 
  

   and 
  brownmg 
  of 
  the 
  leaves. 
  In 
  appearance, 
  on 
  the 
  other 
  

   nand, 
  the 
  attacked 
  foliage 
  of 
  the 
  R. 
  villosus 
  is 
  quite 
  striking, 
  

   naving 
  a 
  rich 
  red 
  discoloration 
  of 
  the 
  upper 
  surface, 
  as 
  if 
  

   "pemng, 
  a 
  fact 
  that 
  has 
  been 
  mentioned 
  above 
  for 
  P. 
  viticola 
  

   upon 
  the 
  leaves 
  of 
  the 
  two 
  Ampelopsis 
  hosts. 
  

  

  ■I 
  he 
  Peronospora 
  obovata 
  we 
  can 
  welcome, 
  as 
  it 
  preys 
  

   upon 
  a 
  weed, 
  but 
  with 
  the 
  species 
  upon 
  the 
  genus 
  Rubus'it 
  

   niust 
  be 
  otherwise. 
  As 
  yet 
  we 
  have 
  not 
  suffered 
  from 
  it, 
  but 
  

   onjy 
  recall 
  the 
  nature 
  of 
  the 
  close 
  kin 
  of 
  this 
  mildew 
  and 
  

  

  r 
  ri 
  ^S 
  "^^"^^ 
  ^^^^ 
  ^^^^ 
  ^^^^ 
  ^^^ 
  *^^^ 
  ^^""^ 
  Rubus 
  are 
  so 
  nearly 
  

   elated 
  that 
  when 
  one 
  is 
  attacked 
  by 
  rust 
  or 
  anthracnose, 
  

  

  '^ 
  are 
  liableto 
  suffer, 
  and 
  it 
  becomes 
  evident 
  that 
  in 
  Pero- 
  

  

  ospora 
  Rubi 
  we 
  may 
  have 
  a 
  serious 
  enemy 
  to 
  our 
  bluckber- 
  

  

  }^]l 
  ^''^spberries 
  and 
  blackcaps 
  that 
  could 
  add 
  a 
  heavy 
  load 
  

  

  the 
  already 
  great 
  burden 
  of 
  plant 
  diseases 
  that 
  the 
  small 
  

  

  un 
  grower 
  is 
  forced 
  to 
  bear. 
  It 
  is 
  in 
  such 
  cases 
  as 
  this 
  that 
  

  

  law 
  for 
  the 
  destruction 
  of 
  fungi 
  could 
  be 
  operative 
  and 
  

  

  beT 
  !,' 
  ^^ 
  ^^y 
  ^^ 
  ^^^^f 
  the 
  Rubus 
  Peronospora 
  is 
  only 
  to 
  

  

  at 
  X^\ 
  ^" 
  ^ 
  ^^^^ 
  places, 
  and 
  therefore 
  could 
  be 
  exterminated 
  

  

  fni'l 
  ^/Pense. 
  But 
  when 
  once 
  it 
  has 
  spread 
  through 
  the 
  

  

  tu 
  ^^^^ens 
  it 
  will 
  be 
  an 
  enemy 
  demanding 
  attention 
  like 
  

  

  the 
  one 
  upon 
  the 
  grape. 
  ^ 
  

  

  ut(P 
  P 
  •' 
  ----""J 
  the 
  oospores 
  of 
  Cysiopis 
  Jfon:a(B-fandur' 
  

   di?t 
  / 
  ; 
  ^^^^ 
  ^^en 
  looked 
  for 
  in 
  vain. 
  As 
  Dr. 
  Fariow 
  pre- 
  

   ued, 
  they 
  were 
  found 
  in 
  the 
  stem 
  of 
  the 
  host. 
  During 
  the 
  

   {j^^sent 
  summer, 
  while 
  in 
  the 
  field 
  studving 
  the 
  diseases 
  of 
  

   the 
  1 
  ^^ 
  potato, 
  this 
  white 
  mould 
  was 
  found 
  abundant 
  upon 
  

   this 
  K 
  ^^' 
  '^^^ 
  ^" 
  "° 
  ^ase 
  were 
  the 
  oospores 
  met 
  with 
  upon 
  

   t^ost. 
  In 
  adjoining 
  fields 
  of 
  corn, 
  however, 
  large 
  quan- 
  

  

  