Arthur: Uredinales of Porto Rico 
317 
appearance and microscopic detail with the Stevens’ Porto Rican 
material, and with many other collections from other places, 
which have heretofore been given the Winterian name. The 
Schweinitz name, being much older, is therefore given preference. 
79. Aecidium decoloratum Schw. ; Berk. & Curt. Jour. Phila. 
Acad. Sci. 2 : 283. 1853. 
Aecidium Clibadii Syd. Ann. Myc. i : 333. 1903. 
On Carduaceae: 
Clibadium erosum (Sw.) DC., Jajome Alto, Dec. 3, 5(555. 
The type material in the Schweinitz collection at Philadelphia . 
consists of the larger part of four or five leaves, which originally 
measured about 16 to 22 cm. long and 10-12 cm. wide. They 
bear numerous groups of aecia. The inscription in Schweinitz’s 
handwriting reads, '‘Aecidium decoloratum — in foliis an Syng. 
— Surinam.” A likeness was detected between these large com- 
posite leaves and those of the Stevens’ collection. Through the 
kindness of the authorities of the Philadelphia Academy of Sci- 
ences, it was possible to submit the Schweinitz material to Mr. 
Percy Wilson of the New York Bot. Garden, who readily ascer- 
tained the host to be Clibadium surinamense L., a common com- 
posite plant of Dutch Guiana. 
80. Aecidium expansum Diet. Hedwigia 38: 258. 1899. 
On Carduaceae: 
Mikania cordifolia (L. f.) Willd., Coamo Springs, Jan. i, 
po; Mayagiiez, April 30, pp5a. May i, 1061, May 2, 1130, 
June 13, 2220, Oct. 31, 3894; Yauco, Oct. 3, 3126; 
Monte de Oro near Cayey, Dec. 3, 3/42; Lares, Nov. 22, 
4934, 4935i Jajome Alto, Dec. 3, 5758; River junction 
below Utuado, Dec. 17, 6o6g, Dec. 30, 6383, 6873. 
Mikania sp.. Villa Alba, Jan. 3, 133. 
No original material of this species has been available for com- 
parison, but the agreement of the Porto Rican material with the 
description of the Brazilian fungus is remarkably close, the only 
discrepancy being the slightly smaller spore measurements for 
