﻿-i"2 
  Arthur: 
  New 
  species 
  of 
  Uredineae 
  

  

  pera 
  1 
  

   Jack 
  

  

  1906. 
  

  

  which 
  this 
  rust 
  belongs, 
  has 
  suggested 
  a 
  change 
  of 
  the 
  name, 
  as 
  

   the 
  one 
  under 
  which 
  it 
  is 
  now 
  known 
  he 
  finds 
  to 
  be 
  preoccupied. 
  

   The 
  rust 
  is 
  on 
  Heterisia 
  Merlensiana 
  (Bong.) 
  Small 
  (Saxifraga 
  

   Mertensiana 
  Bong., 
  6". 
  hetemntha 
  Hook.), 
  and 
  beside 
  the 
  type 
  

   collection 
  from 
  Mt. 
  Adams 
  (Mt. 
  Paddo), 
  Washington, 
  at 
  about 
  

  

  H 
  

  

  2000 
  meters 
  altitude, 
  is 
  now 
  known 
  by 
  an 
  ample 
  collection 
  from 
  

   the 
  vicinity 
  of 
  Grinnell 
  glacier, 
  1 
  650-1950 
  meters 
  altitude. 
  Glacier 
  

   National 
  Park, 
  Montana, 
  July 
  31, 
  1919, 
  Paul 
  C. 
  Standley 
  16814- 
  

  

  Uromyces 
  imperfectus 
  nom. 
  nov. 
  

  

  Uredo 
  Bauhiniae 
  Berk. 
  & 
  Curt. 
  Proc. 
  Am. 
  Acad. 
  4: 
  126. 
  i860. 
  

   Uromyces 
  Bauhiniae 
  Vesterg. 
  Ark. 
  Bot. 
  Stockh. 
  4»5: 
  21. 
  1905. 
  

  

  Not 
  U. 
  Bauhiniae 
  P. 
  Henn. 
  1895. 
  

  

  As 
  the 
  specific 
  name 
  for 
  this 
  species 
  Is 
  preoccupied, 
  a 
  new 
  

   name 
  becomes 
  necessary. 
  Only 
  two 
  collections 
  have 
  been 
  seen 
  

   by 
  the 
  writer, 
  one 
  being 
  the 
  type 
  collection 
  from 
  Nicaragua, 
  and 
  

  

  Holway 
  

  

  Moneague, 
  Jamaica, 
  Februarv 
  24. 
  iQm, 
  E. 
  W. 
  

  

  Uredo 
  contraria 
  sp. 
  nov. 
  

  

  i-o 
  

  

  mm. 
  m 
  aiameter, 
  early 
  naked, 
  yellow, 
  very 
  pulverulent, 
  ruptured 
  

   epidermis" 
  inconspicuous; 
  urediniospores 
  oblong 
  or 
  obovate- 
  

   oblong, 
  20-24 
  by 
  27-35 
  /x; 
  wall 
  colorless, 
  1.5-2 
  /x 
  thick, 
  finely 
  

   and 
  rather 
  sparsely 
  echlnulate, 
  the 
  pores 
  obscure. 
  

  

  On 
  Phacelia 
  tanacetifolia 
  Benth., 
  Carmel, 
  California, 
  April 
  15, 
  

   1919, 
  E. 
  W. 
  D. 
  Hohvay, 
  July 
  4, 
  and 
  October 
  i, 
  1919, 
  Mrs, 
  Joseph 
  

   Clemens. 
  

  

  This 
  rust, 
  in 
  its 
  gross 
  appearance 
  and 
  even 
  in 
  the 
  microscopic 
  

   appearance 
  of 
  its 
  spores, 
  resembles 
  species 
  of 
  Pucciniastrum 
  , 
  but 
  

   careful 
  sectioning 
  of 
  the 
  sori 
  shows 
  them 
  to 
  be 
  applanate, 
  and 
  

   without' 
  peridium 
  or 
  paraphyses. 
  The 
  spores 
  are 
  produced 
  in 
  

   abundance, 
  and 
  due 
  to 
  their 
  bright 
  yellow 
  contents, 
  make 
  a 
  con- 
  

   siderable 
  showing 
  of 
  yellow 
  powder 
  on 
  the 
  under 
  side 
  of 
  the 
  leaves. 
  

   The 
  species 
  occurs 
  among 
  the 
  sand 
  dunes 
  where 
  Pinus 
  radiata 
  

   grows, 
  and 
  along 
  the 
  dusty 
  roadsides 
  of 
  the 
  region. 
  It 
  was 
  watched 
  

  

  