Parasitic fungi bf Illinois. 403 



6^48. Pisum sativum: Champaign, Oct. 19 (Burrill). As- 

 trayalus Canadensis: Jo Daviess, Sept. 15, 5907; Stephenson, 

 Sept. 21, 6074. Ampliicarpcea monoica: La Salle, Sept. 12, 1473, 

 1482; Henry, Sept. 28, 1719; Jo Daviess, Sept. 20, 6036; Ogle^ 

 Sept. 22, 6099. CEnothera biennis: Champaign, Sept. 19, 6616; 

 Union, Sept. 3 (Earle). 



The form on Clematis is referred by authors (Bessey, The 

 Erysiphei, p. 13 ; Trelease, Parasitic Fungi of Wis., p. 9) to 

 E. tortilis, (Wallr) Fr., or, as often written, E. tortilis, Link. 

 It seems a mistake to separate it from the other forms occur- 

 ring on Ranunculacece, some of which have equally long ap- 

 pendages; especially as on Clematis these are radiant, and more 

 or less interwoven with the mycelium as is usual in E. commu- 

 nis, while in European specimens of E. tortilis on Cornus 

 (Rabh. Fungi Europ. No. 2033; J. Kunze, Fungi Selecti 

 Exsic., No. 577, etc.), the appendages are fasciculate and 

 assurgent. (See also Tulasne, Selec. Fung. Carp., I., pp. 213- 

 216). 



The forms on Leguminosce, etc., are often referred to E. 

 Martii, Lev. De Bary (Morph. und Phys. der Pilze, III., p. 50) 

 and Tulasne (1. c. p. 215) agree in considering this a synonym 

 of E. communis. Winter, however, (Die Pilze, II., p. 31) re- 

 tains E. Martii and refers to it all forms having hyaline ap- 

 pendages; but he says that he cannot decide whether this 

 character is always constant and sufficient for their separation. 

 Careful examination and comparison of the herbarium speci- 

 mens specially mentioned by Winter, show that this character 

 is not constant, for some of those given by him under E. Martii 

 have distinctly colored appendages, while in some of those 

 given under E. communis they are very slightly, if at all, col- 

 ored. In fact the coloring of the appendages seems to depend, 

 to a considerable extent, on the age and vigor of the specimen, 

 being light colored or hyaline in the young, and often quite 

 dark in fully matured, vigorous specimens. A portion, at least, 

 of the appendages often remains hyaline on Leguminosce, while 

 on Ranunculacece they are usually all quite dark. All our 

 specimens show more or less distinctly colored appendages. 



