444 
J. C. ARTHUR 
also from Guatemala, in size of spores and in having pedicels that are 
not inflated. Most collections from Mexico possess strongly inflated 
pedicels, with thicker walls to the urediniospores and teliospores, 
larger spores, and other correlated differences. There are, however, 
collections showing intermediate characters, as one from Chapala, 
Mex. (Barth. N. Am. Ured. i86), which also has pycnia and aecia 
present. Although the variation is considerable, yet there does not 
seem to be sufficient reason at present to consider the Mexican form 
distinct from the Guatemalan one. 
The type collection was made by Heyde and Lux at Jumaytepeque, 
Dept. Santa Rosa (Ann. Myc. i: i6. i go , and on Bo uvardia leiantha. 
94. Uromyces Hellerianus Arth. (on Cucurbitaceae). 
Melothria scabra Naud., Guatemala City, Dec. 23, 191 6, II, III, 
630. 
Melothria sp., Chinautla, Dept. Guatemala, Feb. 12, 1916, II, III, 
483^ 
Genus and species undetermined, Mendez, Dept. Guatemala, Feb. 
13, 1917, ii. III, 862. 
The early stages of this long-cycle rust have not yet been discovered. 
The species was collected by Kellerman on Cayaponia racemosa scaher- 
rima Cogn., at Moran, Dept. Amatitlan, February 1906, ii, III, S43^j 
and reported by Kern in Journ. Myc. /. c. The three collections here 
listed are the only ones known except from the West Indies. 
95. Uromyces pressus Arth. & Holw. (on Carduaceae). 
Vernonia Deppeana Less., San Lucas Tollman, 5100 feet alt.. Dept. 
Solola, Feb. 2, 1915, II, 173; Malacatancito, Dept. Huehueten- 
ango, Jan. 24, 1917, II, //p. 
The life cycle includes pycnia, uredinia, and telia. The species 
also occurs in Costa Rica on the same host. 
96. Uromyces Polymniae (P. Henn.) Diet. & Holw. (on Carduaceae). 
Polymnia maculata Cav., San Rafael, Dept. Guatemala, Jan. 7, 
1915, II, iii, jo; same, 7000 feet alt., Jan. 10, 1915, II, 62; 
Volcan de Agua, Dept. Sacatepequez, March 4, 1916, III, 55J; 
Quezaltenango, Jan. 18, 1917, II, III, 749. 
A long-cycle rust, having pycnia, aecia, uredinia, and telia, com- 
mon in Mexico, and also occurring in South America. 
97. Uromyces cucullatus Sydow (on Carduaceae). 
Perymenium strigillosum (Rob. & Greenm.) Antigua, Dept. Sacate- 
