UREDINALES OF GUATEMALA 463 
host possible, taken at different periods and under diversified condi- 
tions of growth, are made available, can the taxonomic status of the 
various forms be reasonably well worked out. Dr. E. B. Mains has 
recently studied all the material in the writer's herbarium, and the 
seven species included in this article are in accordance with the results 
of this study. 
The writer is deeply indebted to Professor Luigi Buscalioni, 
Director of the Royal Botanic Garden of Catania, Sicily, who is 
monographing the genus Saurauja, for his painstaking examination of 
the hosts for the two species of rusts on this genus. No fruit or flowers 
were present, making the task a difficult one. Thanks are also due to 
a number of American botanists who have given critical judgment 
upon the hosts of quite a number of collections. In general the hosts 
have been named for Professor Holway from phanerogamic specimens 
gathered at the same time as the rust specimens and submitted to 
various phanerogamic authorities. 
102. PucciNiA SoRGHi Schw. (on Poaceae). 
Euchlaena mexicanaSchrsid. ' 
Zea Mays L. 
A specimen of this rust, common wherever Indian corn is grown, 
was collected by Kellerman on Zea Mays at Guatemala City, Feb. 3, 
1905, II, S474j and reported by Kern in Journ. Mycol. /. c. A speci- 
men was also taken by him on Euchlaena mexicana at Guatemala City, 
Feb. 23, 1906, II, S077. 
103. PucciNiA PURPUREA Cooke (on Poaceae). 
Sorghum vulgar e Pers. 
This common tropical rust was collected by Kellerman, at Antigua, 
Dept. Sacatepequez, Feb. 8, 1907, and issued in Kellerm. Fungi Sel. 
Guat. 16. 
104. PucciNiA Andropogonis Schwein. (on Poaceae). 
Andropogon condensatus H.B.K., San Lucas Tollman, 5100 feet 
alt., Dept. Solola, Feb. 2, 1915, II, III, 178. 
A common rust of the whole United States, having aecia on Castil- 
leja and Pentstemon, but not before taken south of the border. 
105. Puccinia infuscans Arthur & Holway sp. nov. (on Poaceae). 
Imperata hraziliensis Trin., Guatemala City, Jan. 3, 1915, 15. 
Uredinia hypophyllous, scattered, oblong or linear, 0.5-1 mm. 
long, soon naked, chestnut-brown, pulverulent, ruptured epidermis 
