Arthur: Uredinales of Porto Rico 



93 



only from Mexico and Central America and only on Tripsacum 

 lanceolatum Rupr. The credit for its discovery should be given 

 to Mr. J. A. Stevenson, who first detected it in company with 

 Dr. Olive. 



106. Uredo Dichromenae Arth. 

 On Cyperaceae: 



Dichromena ciliata Vahl, Mayaguez, March 27, 44; Na- 

 guabo on slope of El Duque, April 19, 46; Rio Piedras. 

 April 22, 45. 



Dichromena radicans Cham. & Schl., Mayaguez, March 

 8, 50; Maricao, March 23, 49; Anasco, March 28, 48; 

 El Yunque, April 12, 51; Naguabo on slope of El Duque, 

 April 19, 47. 



107. Uredo Fuirenae P. Henn. 

 On Cyperaceae: 



Fuirena umbellata Rottb., El Yunque, April 12, 28; Na- 

 guabo along railroad, April 19, 2J. 

 Fuirena sp., Naguabo on slope of El Duque, April 19, 442. 



108. Uredo superior Arth. 

 On Cyperaceae : 



Fimbristylis ferruginea (L.) Vahl, Martin Pena, April 10, 



Fimbristylis spadicea (L.) Vahl, Mayaguez, road to 

 Guanajibos, March 3, 24. 

 Heretofore only the type collection of this species was known. 

 It was collected near Ponce, on F. spadicea, Dec. 12, 1902, by A. 

 A. Heller 62J9. The urediniospores of this species are much 

 larger and thicker- walled than are those of Puccinia Fim- 

 bristylidis. 



The present collection on F. ferruginea, as well as the two 

 collections previously recorded in the Stevens list, do not have 

 urediniospores as uniformly large and thick-walled as those on 

 F. spadicea, but all the material in han ! d shows so much greater 

 resemblance to this species than to P. Fimbristylidis, that it is 

 transferred here pending the finding of teliospores. 



