1905) ARTHUR—RUSTS ON COMPOSITAE FROM MEXICO 203 
Guadalajara, Sept. 28, 1903, no. 5028: T. /ucida Cav., Patzcuaro, Oct. 19, 1898, 
no. 3233; Cuernavaca, Oct. 29, 1903, no. 5264: T. micrantha Cav., San Angel, 
City of Mexico, Oct. 1, 1900 (C. G. Pringle): Tagetes sp., Guadalajara, Sept. 15, 
1899, no. 3423; Oaxaca, Oct. 20, 1899, no. 3685; City of Mexico, Oct. 19, 1903, 
NO. 5179. 
28. Pucctn1A ZEXMENIAE Diet. and Holw. 
On Zexmenia podocephala A. Gr., Patzcuaro, Oct. 20, 1898, no. 3215, Oct. 
13, 1899, no. 3626; Chapala, Sept. 20, 1899, no. 3468: Z. fasciculata A. Gr., 
Patzcuaro, Oct. 18, 1898, no. 3101; Cuernavaca, Sept. 30, 1899, no. 3530: Z. 
ceanothijolia Schz. Bip., Guadalajara, Sept. 28, 1903, no. 5058; Cuernavaca. 
Oct. 29, 1903, no. 5268: Z. helianthoides A. Gr., Cuernavaca, Sept. 30, 1899, no, 
3531: Z. elegans Schz. Bip., Patzcuaro, Oct. 13, 1899, no. 3632: Z. crocea A. Gr., 
Cuernavaca, Sept. 25, 1898, no. 3016; Cuautla, State of Morelos, Oct. 23, 1903, 
no. 5232: Z, aurea B. & H., Rio Hondo, near City of Mexico, Oct. 4, 1899, no. 
3566: Zexmenia sp., Chapala, Oct. 5, 1903, no. 5116. 
A number of these collections have well developed aecidia with the other 
rig and no. 3016 shows only aecidia. The teleutospores are quite variable 
i size and roughness of surface. 
29. PuccinrA opaca Diet. and Holw. 
On Zexmenia sp., Guadalajara, Sept. 29, 1903, no. 5069; Patzcuaro, Oct. 
16, 1898, no. 3002. 
ig of these collections, no. 5069, shows aecidia in good condition. The 
vee b 2 deep-seated in the tissues, appear hemispherical on the surface, and 
< ya small orifice; the peridial cells are loosely united, and fall away readily; 
© aecidiospores are somewhat smaller than those in Puccinia Zexmeniae, and 
have a thicker wall. 
. 30. Puccinia Diaziana, n. sp.—Teleutosori hypophyllous, in 
8 Sle 3-8™™ across, on pale spots, often annular, small, 
igh or less in diameter, round, pulvinate, chestnut-brown or 
Pe €r; teleutospores linear-oblong or oblong-fusiform, 15-21 by 
a usually narrowed and obtuse at each end, slightly constricted 
ae a wall cinnamon-brown, paler below, smooth, thin, 1-1. 5#, 
Le i. at apex, s-8u; pedicel slightly tinted, thick, half 
ore. 
ae ety 
Diaz oa, ese Cav. (Verbesina encelioides A. Gr.), City of Porfirio 
ek Oahuila, Oct. 10, 1900. 
Nate .., belongs to the LepropuccrNtA section, as the spores germi- 
Of this cect. sus Centrifugally as they mature. It differs from most species. 
n inhabiting composite hosts by having the sori well separated from 
One ano} i 
ther, instead of crowded in a compact group. 
