Arthur: Uredinales of Porto Rico 75 



Rhynchospora cyperoides (Sw.) Mart., El Yunque, April 

 12, II, 31; Catario, April 20, II, iii, 32. 



This is the first recognition of the rust in the West Indies. It 

 also occurs as uredinia on R. aitrea Vahl from Mayagiiez, P. R., 

 as well as on R. cyperoides from the Bahamas, both mentioned in 

 the Stevens' Porto Rican list (Mycol. 7: 182), and in the N. 

 Am. Flora (7: 232, 233), under Uromyces Rhyncosporae. The 

 two forms are undoubtedly correlated, but the form with two- 

 celled teliospores appears to have somewhat larger and thicker- 

 walled urediniospores, which also show more variability in size. 



The species has heretofore been known from a few localities in 

 Alabama, Louisiana and Texas, on R. comiculdta. The telio- 

 spores on R. cyperoides appear to be somewhat longer and less 

 thickened at apex than those on R. corniculata. The other hosts 

 show only uredinia. 



49. Puccinia Scleriae (Paz.) comb. nov. 



Rostrupia Scleriae Paz., Hedw. 31 : 96. 1892. 

 On Cyperaceae : 



Scleria cubensis Boeckl, Maricao on Rio Grande river, 



March 24, II, 389. 

 Scleria pterota Presl, Mayagiiez, March 9-April 3, II, III, 

 386; Maricao, March 23, II, III, 388; El Yunque, April 

 12, II, 383; Naguabo on slope of El Duque, April 19, 

 II, III, 382. 



Soon after arriving in Porto Rico Messrs. Whetzel and Olive 

 sent to Lafayette, Indiana, the rusted parts as well as living plants 

 of " a herbaceous vine, possibly Passiflora, and a sedge," repre- 

 senting a " possible combination." They wrote that " the two 

 always occur together," being " very abundant," in the vicinity of 

 Mayagiiez. This initial lot of material was followed by ample 

 collections of the two forms of rust, and of corroborative observa- 

 tions. The hosts were later determined as Passiflora rubra and 

 Scleria pterota. Repeated attempts to germinate either the aecio- 

 spores or teliospores utterly failed, so that no cultures were 

 secured, but the writer is inclined to think that a good clue has 

 been secured, and that the two forms will eventually be found to 

 be alternate stages of the same species. 



