Panisific Fungi of Illinois. 401 



ages long, stout, usuiilly colored throughout, flexuous, some- 

 what uneven in width, more or less interwoven with the my- 

 celium; ascus rather small, elliptical or suborbicular; spores 

 usually 8, small, about 15 ^i long. 



On Bidens frondosa: Jo Daviess, Sept 15, 5004; Stephen- 

 son, Sept. 13, 5842; Lee, Sept. 9, 5743; McLean, July 2, 2370; 

 La Salle, Sept. 12, 1489, Sept. 16, 1554; Henry, Sept. 28, 1708; 

 McHenry, Aug. 20, 1168; Union, Sept. 13 (Earle). Bidens 

 connahis: Rock Island, Sept. 24, 1624; Fulton, Oct. 1, 1777. 

 Erechthifes hieracifolia: McHenry, Aug. 23, 1234; Champaign, 

 Sept. 19, 6615; Adams, Aug. 20 (Seymour). Nahalns sps.: 

 McLean, Sept. 20, 5662; Jo Daviess, Sept. 16, 5945. Taraxi- 

 cvm dens leonis: Champaign, Oct. 16, 6580, Oct. 23, 6590. 

 Veronica Virginica: McHenry, Aug. 27, 1333; Stephenson, 

 Sept. 13, 5809^ Sept 14, 5878; Jo Daviess, Sept. 15, 5906. Sept. 

 18, 5975, Sept. 19. 6002, Sept. 20, 6017; Ogle, Sept. 23, 6134. 

 Gerardia grand i flora: Ogle, Sept. 23,6129. Briinella vulgaris: 

 McLean, July 3 (Seymour); Champaign, Oct. (Waite). 



This abundant and widespread species can be easily distin- 

 guished from the form on Bosacece, etc., that has usually 

 been associated with it, by the peculiarly low and large- 

 celled, wall of the perithecium, and by the larger, more flexu- 

 ous appendages. The spores, too, average smaller. It varies 

 considerably on the different hosts, in the appearance of the 

 mycelium and the size of the peritbecia, these being larger 

 thaa the average on Erechthites and usually smaller on Veroni- 

 ca; but the more important characteristics appear to be con- 

 stant. 



Erysiphe, (Hedw.) Lev. 



(Ann. Sci. Nat., Ser. III., Tome. XV.) 



Perithecium containing several asci; appendages simple 

 threads similar to and frequently interwoven with the my- 

 celium. 



E. liriodendri, Schw. 



(N. A. Fungi, p. 269.) 



On leaves and succulent stems. Mycelium abundant, dense, 

 white, persistent; perithecia developing late, mostly after the 



