1905] ARTHUR—RUSTS ON COMPOSITAE FROM MEXICO 207 
Sept. 30, 1903, no. 5079: V. helianthoides HBK., Santa Fé, near City of Mexico, 
18, 1903, no. 5173; Tehuacan, Nov. 8, 1903, no. 5358: V. buddleiformis 
Benth. & Hook. f., Patzcuaro, Oct. 20. 1898, no. 3217, Oct. 13, 1899, no. 3630; 
Rio Hondo near City of Mexico, Oct. 4, 1899, no. 3563; Morelia, Oct. 14, 1899, 
no. 3634: Viguiera sp., Guadalajara, Sept. 29, 1903, no. 5070. 
The teleutospores on each species of host differ a little from all the others. It 
would be possible to make as many species of rusts as there are species of Viguiera, 
but the differences are of a character that can very plausibly be ascribed to the 
influence of the host, and it seems more in keeping with the present conception 
of species, therefore, to list these slight variations, whose limits are yet undeter- 
mined, under a single name. The specimens cited, therefore, include what have 
been separated as Puccinia abrupta D. & H. and P. subglobosa D. & H. An 
examination of the type material of P. Viguierae Peck, discloses the fact that the 
host was incorrectly determined by the collector. The rust is clearly not one of 
the forms on Viguiera, but is doubtless P. Helianthi Schw. 
44. PUccINIA NANOMITRA Syd. 
On Viguiera eriophora Greenm., Oaxaca, Oct. 21, 1899, no. 3689: V. dentata 
Spreng., Oaxaca, Oct. 25, 1899, no. 3744. 
45. Puccinta IostePHANeEs Diet. and Holw. 
On Iostephane heterophylla Benth., Cuernavaca, Oct. 30, 1903, no. 5291. 
40. Pucciyta cocnata Syd. 
On Verbesina tetraptera A. Gr., City of Mexico, Oct. 11, 1898, no. 3061; Rio 
Hondo, hear City of Mexico, Oct. 4, 1899, no. 3564; Patzcuaro, Oct. 13, 1899, 
ie 027; Oaxaca, Oct. 21, 1899, no. 3706: V. pinnatifida Cav., Cuernavaca, 
7 192d NO. 5327: V. sphaerocephala A. Gr., Zypotlan, State of Jalisco 
; 9, 1903, no. 5141: V. montanoijolia Rob. & Greenm., Patzcuaro, Oct. 16, 
No. 3000, Oct. ro, 1899, nos. 3605, 3606; Morelia, Oct. 8, 1899, no. 3592: 
= sig on V. sphaerocephala is without teleutospores, and is referred 
much a: slight doubt, as the uredospores of several related species are 
Possible ae In deciding upon the boundaries of this species it has not been 
itzian aeree with Sypow in his Monographia Uredinearum. The Schwein- 
eta which is founded upon a South Carolina collection, probably on 
time, occidentalis, although the specific determination was not made at the 
on a to be confined to southeastern United States, and is not yet reported 
Similis ea than V. occidentalis. The species named by Lone Puccimia 
wees © changed by Sypow to P. cognata, occurs from Texas southward, 
Siti ape of hosts. It may be identical with the South American P. Spegas- 
has sii +» but the exact proof is not at hand. The form on P. montanoijolia 
OS eed and paler spores, but otherwise the same. No. 3606 is 
y an abundance of aecidia. 
47. Pucctnta FEROX Diet. and Holw. 
: 
: 
