228 Illinois State Lahonitorij of Natural Ilistonj. 



i^pots orbicular, scarcely thickened, reddish purple, sometimes 

 stained with yellow ; peridia short, crowded, generally with a small free 

 central space ; spores orange, snbglobose, small, .0005 in. in diameter. 

 Not unfrequently a reddish purple dash extends from the spot to the 

 margin of the leaf. The cups sometimes occur sparingly on the upper 

 surface of the leaf. The free central space appears umbilicus-like, and, 

 when present, is a noticeable feature.— Peck, Rep. N. Y. State Mus., 

 XXIII. p. 60. 



On (UnotJiera hmmis: Union, April 27, 4334; Pulaski, 

 May 8, 4566; McLean, May 20,4721, May 23, 4757, May 25, 

 4780, May 29, 4802, May 30, 4824. May 31, 4848, June 1, 4883. 

 June 14. 4975, June 19,5270; Champaign, June 8, 4892; La- 

 Salle, June 15, 4998; Adams, July 3, 5390. 



^. sambuci, Schw. 



Hypogenous. Spots conspicuous, yellow, swollen; aecidia 

 circinate or more often densely and irregularly crowded, short, 

 deeply split and recurved; spores suhglobose, epispore thin, 

 minutely tuberculate, 18-21 ^; spermagonia very few, in the 

 center of the spots on both sides of the leaf. 



On Samhucm Canadensis: Pulaski, May 5, 4493, 4497; 

 May 8, 4560; McLean, May 31, 4859 (undeveloped), June 1, 

 4890 (undeveloped). 



On the young stems the aecidia often occur in large dense 

 clusters with much distortion of the host. 



M. diodise, Burrill. 



Hypophyllous, on the cotyledons and rarely lower leaves. 

 Spots distinct, small, greenish brown ; aecidia few, in little ir- 

 regular clusters, small, short, border little or not at all recurved; 

 spores subglobose or elliptical, epispore rather thin, tuberculate, 

 17-21 by 21-30 w; spermagonia rather numerous, scattered, 

 above, not found on many of the spots. 



On Diodia teres: Johnson, May 13, 4661, May 16, 4700. 



This may be the aecidium of Uronii/ces spermacoces, which 

 grows on the same host. 



-ffi, cephalanthi, Seymour. 



Hypogenous. Spots distinct, brown, scarcely thickened; 

 aecidia numerous, irregularly crowded, short, the strongly re- 



