318 
Mycologia 
the South American collection, which is well within the limits of 
laboratory variation. 
The species shows a luxuriant and abundant development, and 
is doubtless heteroecious. 
8i. Aecidium Wedeliae Earle, Muhlenbergia i : i6. 1901. 
On Carduaceae: 
Wedelia trilobata (L.) Hitch. (W. carnosa Pers., Stem- 
modontia trilobata Small), Mayagiiez, July 27, 1912, 
72, Jan. 15, 283, April 27, 833; Cabo Rojo, June ii, 
2184; Utuado, Nov. 8, 4595a, 4603 ; Maricao, Nov. 18, 
4704a; St. Ana, Dec. 31, 6691; El Gigante near Ad- 
juntas, Dec. 15, 8010; without locality, Jan. 14, 1914, 
6781. 
This form is very common in Porto Rico. Collections from 
the island have been examined from Mayagiiez, by A. A. Heller 
4580, and G. P. Clinton 54, April 1904, from Utuado by Under- 
wood & Griggs, June-July 1901, from San Juan and Santurce, 
by E. W. D. Holway, Jan. 1911, from Trujillo Alto, by J. R. 
Johnston 1042, August 1913, and from Campo Alegre, by J. A. 
Stevenson 2475, Dec. 1915. 
Although recorded from other West Indian islands the only 
specimen examined is from Jamaica, by E. W. D. Holway 213, 
Feb. 1915. 
It has been suggested by Dr. Stevens that this rust may be 
the aecial form of Puccinia canaliculata on Cy perns, which is 
known to produce aecia on Xanthium in the northern United 
States. The morphological characters favor the suggestion. 
Form genus Uredo 
Paraphyses absent, mostly forms belonging to Aecidiaceae, Nos. 82 to 98. 
Paraphyses present. 
Free and peripheral, mostly forms belonging to Aecidiaceae, Nos. 99 to 104. 
Imbricated to form a pseudoperidium, forms probably belonging to Ure- 
dinaceae, Nos. 105 to 108. 
United into a peridium, cellular above, belonging to Uredinaceae, No. 109. 
