﻿Arthur: 
  New 
  species 
  of 
  Uredineae 
  467 
  

  

  southward 
  through 
  Mexico 
  and 
  Central 
  America. 
  It 
  has 
  hereto- 
  

   fore 
  passed 
  under 
  the 
  name 
  of 
  Mel-ampsora 
  arctica. 
  The 
  type 
  

  

  M 
  

  

  W 
  

  

  1910, 
  

  

  May 
  

  

  Mycologia 
  (4: 
  187-188. 
  

  

  July 
  

  

  The 
  first 
  aecia 
  of 
  this 
  species 
  seen 
  by 
  the 
  writer 
  were 
  forwarded 
  

   by 
  Professor 
  Fraser 
  in 
  1910. 
  Word 
  was 
  returned 
  that 
  they 
  were 
  

   an 
  undescribed 
  form, 
  probably 
  belonghig 
  to 
  Melampsora 
  arctica 
  

   on 
  Salix. 
  Tehal 
  material 
  on 
  Salix 
  was 
  secured 
  by 
  Professor 
  

   Fraser 
  in 
  the 
  fall, 
  and 
  sown 
  on 
  Abies 
  balsamea 
  in 
  May, 
  191 
  1, 
  with 
  

   abundant 
  success 
  {cf, 
  Mycologia 
  l.c). 
  Representative 
  specimens 
  

   were 
  sent 
  to 
  the 
  writer, 
  and 
  these 
  now 
  constitute 
  the 
  type 
  material 
  

   for 
  the 
  new 
  species. 
  A 
  similar 
  culture 
  was 
  made 
  in 
  June, 
  1912 
  

   (c/, 
  Mycologia 
  5: 
  238. 
  1913)- 
  

  

  An 
  entirely 
  independent 
  set 
  of 
  observations 
  and 
  cultures 
  

   was 
  made 
  by 
  Mr. 
  E. 
  Bethel 
  in 
  Colorado. 
  He 
  obtained 
  aecia 
  on 
  

  

  July 
  

  

  made 
  

  

  three 
  species 
  of 
  willow. 
  Eighteen 
  days 
  afterward, 
  August 
  3, 
  

   an 
  abundance 
  of 
  uredinia 
  was 
  found 
  on 
  two 
  plants, 
  one 
  probably 
  

   Salix 
  Bebbiana, 
  and 
  the 
  other 
  probably 
  5. 
  Scoideriana, 
  but 
  on 
  two 
  

   other 
  equally 
  vigorous 
  plants 
  of 
  5. 
  amygdaloides 
  there 
  was 
  no 
  

  

  F 
  

  

  indication 
  of 
  infection. 
  Representative 
  specimens 
  with 
  notes 
  are 
  

   in 
  the 
  Arthur 
  herbariun. 
  

  

  All 
  the 
  aecial 
  collections 
  known 
  to 
  the 
  writer, 
  with 
  the 
  exception 
  

   of 
  one 
  uncertain 
  specimen 
  from 
  the 
  state 
  of 
  Washington, 
  are 
  

   mentioned 
  above, 
  and 
  most 
  of 
  the 
  telial 
  collections. 
  But 
  some 
  

   forty 
  collections 
  believed 
  to 
  belong 
  here, 
  mostly 
  with 
  uredinia 
  

   only, 
  are 
  not 
  listed. 
  The 
  unlisted 
  specimens 
  include 
  the 
  hosts: 
  

   Salix 
  cordata 
  Muhl., 
  S. 
  exigtia 
  Nutt., 
  5. 
  Fendleriana 
  And., 
  5. 
  

   lasiolepis 
  Benth., 
  S. 
  liitea 
  Nutt., 
  5. 
  Mackenziana 
  Barr., 
  S. 
  Nelsoni 
  

   Ball, 
  S, 
  sitchensis 
  Sans., 
  5. 
  taxiJoUa 
  H. 
  B. 
  K., 
  as 
  well 
  as 
  the 
  culti- 
  

   vated 
  forms, 
  5. 
  alba 
  L., 
  5. 
  babylonica 
  L., 
  S. 
  Caprea 
  L., 
  and 
  S. 
  

   purpurea 
  L. 
  These 
  collections 
  come 
  from 
  the 
  following 
  states 
  

   in 
  addition 
  to 
  those 
  mentioned 
  above: 
  Alaska, 
  Arizona, 
  California, 
  

  

  