Parasitic Fungi of Illinois. 231 



On Eupatoriiim. Hypophyllous, Spots distinct, usually 

 few, conspicuous, yellow; secidia irregularly clustered or some- 

 what circinate, short, irregularly split and moderately recurved, 

 soon pulverulent; spores suhglobose, epispore rather thin, mi- 

 nutely tuberculate, 18-20 (*.; spermagonia several, scattered, 

 above, honey-yellow. On Eupaforiinii peyfoliafnm: McLean, 

 July:il, 2424. 



On Silphiinn : Hypophyllous, and often also epiphyllous. 

 Spots distinct, usually widely scattered, not large, yellow, 

 aecidiaj irregularly associated, scarcely crowded, deeply im- 

 mersed, and but slightly projecting above the raised epidermal 

 border, margin many times split or pulverulent, little excurved ; 

 spores subgiobose, often angular, 11-15 ;".; spermagonia rather 

 few, conspicuous, reddish brown, central, on both sides of leaf. 

 On SUpJuniii infefjrifoJiiiiii : McLean, May 3, 4852. S. terebin- 

 thinaceum: McLean,lMay 30,4825, June 23, 5274, July 2, 2420, 

 July' 11, 2421. S. laciniatum: McLean, June, coll. C. A. Hart. 



On Auihrosia: Hypophyllous. Spots large, often conflu- 

 ent, scarcely thickened, yellow or purplish brown; aecidia not 

 closely crowded,'^ irregularly distributed over the spot, with, 

 however, a free central area, short, but not deeply immersed, 

 firm, the coarsely divided border widely and elegantly excurved ; 

 spores subgiobose, usually angular, epispore firm, smooth, 12- 

 15 fi; spermagonia few, central, on both leaf-surfaces, reddish 

 orown. On Ambivsia trijida : Champaign, June. 



On Xanthitim: Hypophyllous, very rarely also epiphyllous. 

 Spots not large, distant, scarcely thickened; yellowish, some- 

 times tinged purple; a3cidia not densely crowded, irregularly 

 distributed or subcircinate, mostly irregular in outline, deeply 

 immersed and protruding little above the raised epidermal bor- 

 der, the margin pulverulent, rarely lobed and excurved; spores 

 subgiobose or elliptical, often angular, epispore rather thin, 

 minutely tuberculate, about 15-18 /j-; spermagonia few, central, 

 mostly above, minute, yellowish brown. On Xanfhium strii- 

 marium: Champaign, June. This is much like the form on 

 Silphiuin., and answers m some respects to ^E. cerhesina\ Schw., 

 and also to .E. tracJieUifoIiafum, Schw., but it is probably 

 neither. The jEcidium is often followed by Puccinia xanthii, 

 Schw., and may be connected therewith. 

 17 



