402 Illinois State Laboratory/ of Natural History. 



leaves have fallen, rather large, 100 jx or more, delicate, thin- 

 walled, embedded in and partially covered by the dense myce- 

 lium, reticulations small and indistinct; appendages several, 

 hyaline, rather long, much interwoven with the mycelium; asci 

 several, eight or more; spores 6 — 8, small. 



On Liriodendron tidipifera: Union, Oct. 29, 2106, 2110; 

 Champaign, (Burrill). Schweinitz describes the peculiarly dense 

 and felted white mycelium of this species. Peck (30th Rep. 

 N. Y. State, Mus., p. 58) mentions it as occurring at Oneida, N. 

 Y., but gives no description. Saccardo (Syl. Fung., I., p. 21) 

 mentions it among " sjyecies inqiiirendcey A full description is 

 published here for the first time. It is not uncommon in Illi- 

 nois but can seldom be collected in good condition. 



E. communis, (Wallr.) Fr. 



(Summa. Veg. Scand., p. 406.) 



Alphitomorpha communis, horridula, Wallr., in part, (Verhdl. Naturf. 



Freunde, I). 

 Erysibe communis, nit Ida, horridala, Rabh. (Deutschl. Crypt. Flora). 

 Erysibe communis, Lk., in part. 

 Erysiphe aquilegise, DC. (Flore Franc, VI., p. 105). 

 Erysiphe pisi, DC. (1. c, VI., p. 274). 

 Erysiphe convolvuli, DC. (1. c, II., p. 274). 

 Erysiphe polygoni, DC. (1. c, II., p. 273). 

 Erysiphe communis, Fr. (Summa. Veg. Scand., p. 406). 

 Erysiphe communis, Martii, Lev., in part, (Ann. Sci. Nat., Ser. III., 



Tome XV). 



Araphigenous. Mycelium abundant, persistent or some- 

 times evanescent; perithecia variable in size and reticulations; 

 appendages variable in length, often quite long, lying on the 

 mycelium or more or less interwoven with it, usually colored 

 in part or throughout, but occasionally all hyaline; asci 4-8, 

 or more; spores mostly 4-8, variable in size. 



On Clematis sps.: Union, Aug. 30 (Earle). Thalidrum 

 jpurpurascens : Jo Daviess, Sept. 18, 5977. Ranunculus abort iv us : 

 McLean, July 16, 2365, Aug. 1, 2367; Jo Daviess, Sept. 15, 5905; 

 Sept. 30, 6040; Champaign, Oct. 23, 6596; Nov. 3, 6609; La 

 Salle, Sept. 30, 6257. Geranium maculatum: La Salle, Sept, 30, 



