Arthur: Uredinales of Porto Rico 
181 
Lasiacis Sloanei (Griseb.) A. S. Hitch. {Paniciim Sloanei 
Griseb.), Arecibo, Jan. 17, 1914, 680 j. 
Paniciim barbinode Trin. (P. molle Auct. not Swartz), 
Guanica, Feb. i, 550; Boqueron, Feb. 15, 550 bis; Maya- 
giiez, March 26, 447, March 9, 480 •, Pehuelas, Nov. 8, 
4560. 
Only one of these collections, 6145 from Mona Island, shows 
teliospores, and that only sparingly so. 
A collection determined by Prof. Hitchcock to be on Lasiacis 
Sivartziana Hitchc. {Panicum lanatum Sw. not Rottb.) was col- 
lected by R. Thaxter, 1891, in Jamaica, and communicated by 
W. G. Farlow, which shows both uredinia and telia. Material 
representing the species has also been collected at Santiago de las 
Vegas, Cuba, on P. barbinode and thought at first to show only 
uredinia, but on which a few telia have recently been detected. 
L. Sloanei is a host for the species not before reported. 
18. Uromyces ignobilis (Sydow) comb. nov. 
Uredo ignobilis Sydow, Ann. Myc. 4: 444. 1906. 
Uromyces major Arth. Bull. Torrey Club 38: 377. 1911. 
Nigredo major Arth. N. Am. Flora 7 : 225. 1912. 
On Poaceae: 
Sporobolus indicus (L.) R. Br., Mayagiiez, II, April 30, 
9 ^ 5 - 
The Stevens material agrees exactly with the description of 
Uredo ignobilis Sydow, the type being on Sporobolus diandrtis 
from Pusa, India, and with the collection by E. J. Butler from 
the type locality, distributed in Sydow, Uredineen 2igg. The 
spores of the Porto Rican material also agree with the four- 
pored, thick-walled urediniospores of Uromyces major, the type 
of which is on some species of Muhlenbergia from the vicinity 
of the City of Mexico. The genera Sporobolus and Muhlen- 
bergia are only technically different, so that it is not surprising 
to find the same tropical rust on hosts belonging to both genera, 
and from very widely separated localities. The three stations 
mentioned are the only ones yet known for the species. 
