474 
J. C. ARTHUR 
Ahutilon sp., Aguas Amargas, Dept. Quezaltenango, Jan. 30, 1917, 
797, 798. 
Malvaviscus arboreus Cav., Mazatenango, Feb. 25, 1916, 529; 
San Felipe, Dept. Retalhuleu, Jan. 12, 1917, 6Q4. 
Malvaviscus sp., Chinautla, Dept. Guatemala, Feb. 12, 191 6, 48^. 
Sida cordifolia L., Sanarate, Dept. Guatemala, Feb. 10, 1916, 4/4. 
A very common short-cycle rust of tropical regions, notable for its 
abundant production of mesospores, and its numerous hosts. It 
was also collected by Kellerman on Sida cordifolia, at Gualan, Dept. 
Zacapa, Jan. 23, 1905, 432 j, and again at the same place, March 12, 
1905, 4J2jbis (Kellerm. Fungi Sel. Guat. 6). 
136. PucciNiA Sherardiana Korn. (on Malvaceae). 
Sida spinosa L., Chinautla, Dept. Guatemala, Feb. 12, 1916, 488. 
A short-cycle species with large golden-brown sori and terete 
teliospores, somewhat resembling P. Malvacearum. It occurs abun- 
dantly in western North America, and ranges southward along the 
mountains to Peru. 
137. PucciNiA EXiLis Syd. (on Malvaceae). 
Pavonia rosea Schlecht., Quirigua, Dept. Zacapa, March 22, 1916, 
593- 
A short-cycle rust, resembling P. heterospora but with much 
smaller teliospores and seemingly without mesospores. This is the 
first record for North America. It has heretofore been known only 
from Brazil. 
138. PucciNiA FiLOPES Arth. & Holw. (on Stercuhaceae). 
Buettneria lateralis Presl, Escuintla, Feb. 17, 1916, 501. 
A short-cycle species for which this number is the type, occurring 
also in Costa Rica. 
139. Puccinia vergrandis Arthur & Holway sp. nov. (on Dilleniaceae) . 
Saurauja pauciserrata HemsL, Colomba, Dept. Quezaltenango, 
Feb. 2, 1917, ii, III, 820. 
Uredinia not seen; urediniospores in the telia, obovoid, 26-32 
by 32-40 fi; wall golden-brown, thick, 3 fx, somewhat thicker above 
up to 5 iJL, coarsely and moderately echinulate, the pores 2-4, approxi- 
mately equatorial or slightly superequatorial. 
Telia chiefly hypophyllous, confluent in annular groups 2-4 mm. 
across, round, 0.3-1 mm. in diameter, early naked, chestnut-brown 
becoming cinereous from germination, ruptured epidermis evident; 
