﻿Arthur: 
  New 
  species 
  of 
  Uredineae 
  469 
  

  

  British 
  Columbia 
  to 
  Nova 
  Scotia, 
  and 
  southward 
  to 
  Iowa 
  and 
  

  

  w 
  

  

  West 
  Virginia, 
  It 
  is 
  especially 
  abundant 
  in 
  the 
  northeastern 
  

  

  * 
  

  

  United 
  States 
  on 
  Riihus 
  strigosus 
  Michx., 
  and 
  less 
  so 
  on 
  R. 
  occi- 
  

   dentalis 
  L. 
  It 
  also 
  occurs 
  on 
  R, 
  pubescens 
  Raf., 
  and 
  in 
  the 
  north- 
  

   west 
  on 
  R. 
  melanolasius 
  Focke. 
  The 
  aecia 
  for 
  both 
  Pucciniastrtim 
  

   drcticum 
  and 
  P. 
  americanwn 
  are 
  unknown. 
  

  

  Puccinia 
  oflfuscata 
  sp. 
  nov, 
  

  

  II. 
  Uredinia 
  amphigenous, 
  scattered, 
  round 
  or 
  oval, 
  0.3-1 
  

   mm. 
  long, 
  rather 
  tardily 
  naked, 
  pulverulent, 
  dark 
  cinnamon- 
  

   brown, 
  ruptured 
  epidermis 
  conspicuous; 
  paraphyses 
  intermixed 
  

   with 
  the 
  spores, 
  slightly 
  clavate, 
  5-9 
  by 
  29-48 
  //, 
  the 
  wall 
  i 
  fx 
  thick, 
  

   colorless, 
  smooth 
  ; 
  urediniospores 
  broadly 
  ellipsoid 
  or 
  broadly 
  

   obovoid, 
  18-23 
  by 
  23-29 
  /x; 
  wall 
  cinnamon-brown, 
  1.5-2.5 
  /z 
  thick, 
  

   finely 
  and 
  closely 
  echinulate, 
  the 
  pores 
  3 
  or 
  4, 
  equatorial. 
  

  

  III. 
  Telia 
  hypophyllous, 
  few, 
  scattered, 
  round, 
  0.1-0.3 
  mm. 
  

   in 
  diameter, 
  rather 
  tardily 
  naked, 
  compact, 
  dark 
  cinnamon-brown, 
  

   ruptured 
  epidermis 
  conspicuous; 
  telicspores 
  clavate, 
  13-18 
  by 
  

   32-53 
  At, 
  rounded 
  above, 
  narrowed 
  below, 
  slightly 
  constricted 
  at 
  

   septum; 
  wall 
  light 
  golden-brown, 
  1-2/2 
  thick, 
  slightly 
  thickened 
  

   at 
  apex, 
  1-5 
  At, 
  smooth; 
  pedicel 
  up 
  to 
  one 
  half 
  length 
  of 
  spore, 
  

   colorless. 
  

  

  On 
  Zornia 
  hracteata 
  (Walt.) 
  Gmel. 
  (Z. 
  tetraphylla 
  Michx.), 
  

  

  Braidentown, 
  Florida, 
  May 
  ii, 
  1900, 
  II, 
  S. 
  M. 
  Tracy 
  6583. 
  

  

  On 
  Zornia 
  diphylla 
  (L). 
  Pers., 
  Pinar 
  del 
  Rio, 
  Cuba, 
  April 
  23, 
  

  

  1903, 
  II, 
  iii, 
  /. 
  A. 
  Shafer 
  2Q2; 
  Herradura, 
  Cuba, 
  September 
  30, 
  

  

  1904. 
  II, 
  iii, 
  C 
  F. 
  Baker 
  2143 
  (type); 
  same, 
  November 
  26, 
  1917, 
  

   II, 
  F. 
  S. 
  Earle 
  822; 
  Mayagiiez, 
  Porto 
  Rico, 
  March 
  7, 
  1916, 
  II, 
  

   Whetzel 
  & 
  Olive 
  200; 
  Barcelonita, 
  Porto 
  Rico, 
  April 
  6, 
  T916, 
  II, 
  

  

  Whetzel 
  & 
  Olive 
  igg. 
  

  

  * 
  

  

  This 
  species 
  of 
  rust 
  has 
  heretofore 
  passed 
  under 
  the 
  name 
  of 
  

   Uredo 
  Zorniae 
  or 
  Puccinia 
  Zorniae, 
  names 
  which 
  properly 
  apply 
  

   to 
  the 
  Old 
  World 
  species 
  on 
  the 
  same 
  tw^o 
  hosts 
  as 
  listed 
  above. 
  

   The 
  two 
  species 
  differ 
  noticeably 
  in 
  both 
  urediniospores 
  and 
  telio- 
  

   spores. 
  The 
  Old 
  World 
  species 
  has 
  urediniospores 
  with 
  two 
  

   pores, 
  or 
  an 
  occasional 
  spore 
  with 
  three 
  pores, 
  and 
  the 
  teliospores 
  

   are 
  not 
  so 
  elongated, 
  much 
  constricted 
  at 
  septum, 
  with 
  the 
  two 
  

   cells 
  nearly 
  of 
  the 
  same 
  size 
  and 
  shape, 
  being 
  globoid. 
  An 
  excel- 
  

   lent 
  description 
  and 
  an 
  illustration 
  from 
  a 
  photograph 
  are 
  given 
  

   by 
  McAIpine, 
  Rusts 
  of 
  Australia, 
  page 
  172, 
  pL 
  10, 
  f. 
  87. 
  

  

  