Parasitic Fungi of 'Illinois. 223 



ever, in . the same way. The spores have thinner walls, are 

 lighter colored, and are said to be more elongated. In the lat- 

 ter respect, however, the specimens collected by Arthur have 

 spores commonly quadrangular, and considerably longer than 

 wide. A Massachusetts specimen agrees with the typical ^E. 

 l>ini datum except that the spermagonia are confined to the 

 lower side of the leaf. That on Hepatica triloba is distinctively 

 ^E. punctatum. 



M. actsese, (Opiz.) Wallr. 



orderless or in circular groups, on pale spots which 

 later are blackish in the centre; pseudoperidia short-cylindrical, 

 with a white tube and many times split and recurved border; 

 spores polygonal, pale yellow, fine-warty, 16-26 /u. in diameter 

 by 30 A*. Winter, Die Pike, p. 268. 



On Actcea: Jackson, April 25 ; 4288. 



The description is taken from European specimens; those 

 from Illinois are not fully developed, but seem to be the same. 



^E. dicentrse, Trelease. 



Hypophyllous. ^Ecidia uniformly and remotely scattered 

 over the entire surface, rather large, prominent, border regu- 

 larly segmented and quite uniformly and abruptly rolled, firm; 

 spores subglobose or elliptical, epispore thin, minutely tubercu- 

 late, 10-13 by 11-16 /*; spermagonia large, disk-like, rather 

 distant in a single row on the margin of the leaf, reddish brown. 



On Dicentra cucullaria: Jackson, April 20, 4195, April 21, 

 4211, April 25, 4289, April. 27, 4345, April 28, 4360; Union, 

 April 24, 4252; McLean, May 22. 4731, May 23, 4753. 



M. Mariae-Wilsoni, Peck. 



Hypogenous. Spots small, definite, not thickened, yellow- 

 ish; aecidia small, short-cylindrical, border narrow, many times 

 split and recurved, subcircinating; spores subglobose or some- 

 what angular, epispore thin, minutely tuberculate, 11-15 ^; 

 spermagonia preceding and, with the aecidia, mostly on the 

 upper side of the leaf. 



