Article VI. — Parasitic Fungi of Illinois. 

 J. BuRRiLL and F. S. Earle. 





,^. Y.W 



. By T. .^!i2^ 



ERYSIPHE^, Lev. 



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



C\n liirinnr nlcmfa IvTvPolinni anrvorfioiol onnciefi 



n<TP rti 



ERRATA. 



Page 389, line 7 from bottom, for carpogonium read sporo- 

 carp; lines 9, 12, 15, for oogonium read carpogonium. 



Page 391, line 1, for Cessatii read Cesatii. 



Page 400, line 4, for Myceliumin conspicuous read Myce- 

 lium inconspicuous; line 14, for coleosporium read Coleosjjoriiwi. 



Page 401, line 9, for connatus read connata ; line 12, for 

 Taraxicum read Taraxacum. 



Page 408, line 15, for macrocarpa read macrospora ; line 

 18, for Hypohyllous read Hypophyllous. 



tered over the whitened surface of the leaves. 



The very abundant mycelium consists of numerous slender, 

 white or colorless, septate threads, that branch widely, and ex- 

 tend over the leaf in every direction, frequently crossing and 

 interlacing. These threads are usually pressed close to the 

 host, but they do not theuiselves enter it.* They send out at 

 intervals, however, short special branches called haustoria, that 



* It is held by some writers that in Sphxrotheca pannosa, Lev., the 

 mycelium does sometimes enter the tissues of the host, but this is not 

 Batisfactorily proven. 

 1 



