232 Illinois State Laboratory of Natural History. 



On Helianthus: Hypophyllous, rarely also epiphyllous. 

 Spots distinct or confluent, usually yellow, somewhat thick- 

 ened; aecidia subcircinate, not usually densely crowded, short, 

 not deeply immersed, deeply split and widely recurved, at first 

 firm, but soon becoming pulverulent; spores subglobose or 

 elliptical, epispore thin, minutely tuberculate; spermagonia few, 

 central, mostly on upper side of leaf, inconspicuous, yellowish 

 brown. On Helianthus sps.: Union, April 24, 4256, 4257, 

 April 26, 4309; Jackson, April 28, 4369; Pulaski, May 9, 4573; 

 Johnson, May 12, 4642, 4643, 4644, May 15, 4689. 



There seem to be two species on Helianthus, and in No. 

 4644 on the same host. In one case the aecidia are in large 

 clusters, with spores about 12-14 by 13-16 /*; in the other case 

 the clusters are small, and the spores measure about 15-21 by 

 20-24 n. 



On Bidens: Hypophyllous, very rarely also epiphyllous. 

 Spots mostly rather large, effused, often confluent, purple, 

 scarcely thickened; aecidia sparsely scattered, rather prominent, 

 border abruptly and rather conspicuously recurved, firm; spores 

 subglobose, epispore thin, minutely tuberculate, 15-17 P; 

 spermagonia few and inconspicuous, mostly central, below ; 

 often altogether wanting. On Bidens frond osa : Adams, June 

 27, 5304; Champaign, midsummer. 



On Lactuca: Hypophyllous. Spots definite, conspicuous, 

 thickened, mostly widely separated, but sometimes numerous 

 and somewhat confluent, purple, then brown; aecidia mostly 

 crowded around a free central space, rather numerous, short, 

 many times irregularly split and widely recurved or pulveru- 

 lent; spores angular, irregularly subglobose or broadly oval, 

 epispore thin, minutely tuberculate, 15-18 |tt; spermagonia ra- 

 ther numerous, scattered centrally above, large, simply convex, 

 reddish brown. On Lactuca Canadensis: McLean, May 20, 

 4720, May 23, 4748, 4759, May 25, 4781, 4781J, May 26, 4798, 

 May 29, 4803, May 30, 4826, May 31, 4849, 4865, June 1, 4884; 

 Champaign, June 8, 4894. 



M. plantaginis, Ces. 



Amphigenous. Spots usually small, sometimes effused and 

 large; aecidia collected in little groups or loosely scattered, 



