Parasifif Fiiiif/I of TU/no/s. 220 



curved narrow horder ahru})t, tiuely divided: spores large, siib- 

 globose or elliptical, epispore very thick, very conspicuously re- 

 ticulately roughened, 28-86 by 83-48 fi; spermagonia scattered 

 over the upper side of infected area, minute, reddish brown. 



On CcpJialdiifliKs occiftcntalis: Kavenswood, near Chicago. 

 June (A.1). lS88).coll. J. C. Arthur; Quincy, July 12 (A-D. 

 18S3).coll. C. A. Hart. 



M. houstoniatum, Sdiw. 



Hypophyllous. ^Ecidia scattered over the entire leaf, 

 small, very short, recurved border narrow, many times split; 

 s{)ores globose or elliptical, often angular, minutely tuberculate, 

 12-15 by 15-18 /t; spermagonia numerous, conspicuous, aj^pear- 

 ing before the iecidia, scattered over the entire under surface, 

 occasionally above, piirple. 



Without distinct spots. Tseudoperidia elevated, pallid, subconical, 

 contracted at the apex, and somewhat excavated. Spores orange. The 

 infected plant, though degenerated, yet flowers. — Schweinitz, N. Auj. 

 Knng., Xo. 2Si)]. p. 203. 



On IloKsfniild (■(i')-iil('a : Union. April 16, 5010 (Earle). 

 April 17, 4188, April 26, 4307; Jackson. April 27. 4844. April 

 28. 4862; Johnson, May 13. 4(568. 



The infected plants are easily recognized, as the fungus 

 causes them to grow more slender and more strictly erect, often 

 taller, and gives them a yellowish a])pearance. 



M. erigeronatum, Schw. 



Hypophyllous. Spots usually distinct, large, swollen, yel- 

 low; aicidia subcircinate or irregularly crowded, short, soon 

 many times divided and much recurved; fragile, soon becoming 

 pulverulent: spores subglobose, epispore thin, tuberculate. 

 12-15 jit: si)ermagonia indistinct, few. usually centrally crowd- 

 ed, mostly on upper side of leaf, yellow. 



Spots large, yellowish, somewhat swollen, pseudoperidia densely 

 distributed, without order, elevated, spores yellowish.— Schweinitz, X. 

 Am. Fungi, No. 2869, p. 292. 



On Erif/eroH Canadrnse: Adams, June 27, 5306, July 6. 

 5434. E. MJklifoliuni : Johnson, May 13, 4664, May 16, 4699. 



