144 



Mycologia 



Type collected at Mayaguez, Porto Rico, on Eleocharis inter- 

 stincta, May 20, 1916, Whetzel & Olive 35. 



Distribution : Known only from Porto Rico and Guatemala. 



No teliospores could be found on the specimens here cited as 

 the foundation of a new species but the urediniospore structure is 

 so characteristic that no other disposition seems satisfactory. 

 The pore arrangement is like that of the preceding species but the 

 spores are very much larger and although often somewhat angular 

 are not laterally compressed. The host of the type specimen was 

 determined by Dr. Britton. The collection was cited as Puccinia 

 Eleocharidis by Arthur in the Uredinales of Porto Rico based 

 on collections by H. H. Whetzel and E. W. Olive. 



8. Puccinia Eleocharidis Arth. Bull. Iowa Agr. 

 Coll. Dept. Bot. 1884: 156. 1884 



Aecidium compositarum Eiipatorii DeToni : in Sacc. Syll. Fung. 

 7 : 798. 1888. 



Dicaeoma Eleocharidis Kuntze, Rev. Gen. 3^ : 468. 1898. 



O. Pycnia amphigenous, few in small orbicular groups, puncti- 

 form, honey-yellow becoming reddish-brown, rather inconspic- 

 uous, globoid, 100-170 /X in diameter; ostiolar filaments 35-60 /x 

 long. 



L Aecia hypophyllous, in crowded groups or in orbicular 

 groups about the pycnia on discolored spots that are usually con- 

 spicuous, cupulate, low, 0.2-0.3 mm. in diameter ; peridium deli- 

 cate, the margin deeply lacerate and revolute ; peridial cells rhom- 

 boidal, 24-34 fx long, the outer wall 4-6 /x thick, striate, the inner 

 wall 2-3 /X, verrucose ; aeciospores globoid, 16-21 by 18-24 ju,; the 

 wall colorless, about i /x thick, finely verrucose. 



On Carduaceae : 



Eupatorium maculatum L., Indiana, Iowa, Nebraska, New 

 York. 



Eupatorittm perfoliatiim L., Delaware, Illinois, Iowa, In- 

 diana, Kansas, Maine, Michigan, Nebraska, New York, 

 Pennsylvania, Wisconsin ; Nova Scotia, Ontario. 



Eupatorium purpureum L., Alabama, Indiana, Iowa, Michi- 



5 See Mycologia 9: 76. 1917- 



