Parasitic Fungi of Illinois. 237 



M. pustulatum, Curtis. 



Hypogenous. Spots small, reddish yellow, thickened; 

 aecidia rather densely crowded, often in a small circle with a 

 vacant centre, short, rather finely split and recurved; spores 

 subglobose, inconspicuously tuberculate, 16-21 n*; spermagonia 

 few, yellowish, epiphyllous, difficult to make out. 



Spots small, yellowish, sometimes stained with red, thickened, often 

 concave above, convex below ; peridia short, subcrowded, often forming 

 a circle about a free central space jspores pale orange, subglobose, 

 .00066-.00083 in. in diameter. Peck, 23 Rep. N. Y. State Mus., p. 60. 



On Comandra umbettata: McLean, May 20, 4717, May 25, 



4782, May 29, 4804, May 30, 4827, 4850; Champaign, June 10, 

 4955. 



M. euphorbias, Gmel. 



Hypophyllous. ^Ecidia uniformly scattered over the en- 

 tire surface, short, the narrowly recurved border soon becoming 

 pulverulent; spores subglobose to oblong, often irregular and 

 angular, epispore rather thick, tuberculate, 12-15 by 15-24 p\ 

 spermagonia scattered among the aecidia or none, not found on 

 the upper side of leaf. 



On leaves of Euphorbia polygonifolia : Ravenswood, near 

 Chicago, Oct. 11, 1883, J. C. Arthur. E. hypericifolia: Adams, 

 June 29, 5350, July 6, 5430; McLean, July 7, 2432, July 27, 

 2431, Oct. 6, 1801; Tazewell, July 22, 2430; Piatt, Aug. 27, 

 1106. E. maculata: Kane, Aug. 30, 1374; McHenry, Sept. 1, 

 1414; Boone, Sept. 2, 1420; LaSalle, Sept. 16, 1548, 1549; 

 Rock Island, Sept. 21, 1617, Sept. 24, 1651. E. dentata: Adams, 

 July 6, 5428; Ogle, Sept. 26, 6182. 



This occurs with Uromyces euphorbia* in Nos. 1064, 1548, 

 1616, 2353, and 5428. The genetic connection has not been 

 ascertained for our plants. 



Persoon is often given as the authority for this name, but 

 in his Syn. Fung., p. 211, he refers to Gmelin as the author. 

 JE. Euphorbiw-hypericifolice, Schw., is probably a synonym. 



-33. crotonopsidis, Burrill. 



Hypogenous, occurring upon the cotyledons, and less com- 

 monly on the caulicle and lower leaves. Spots distinct, dark- 



