Article Y1.— Parasitic Fungi of Illinois. Pabt II. By T. 

 J. BuRRiLL and F. S. Earlb. 



ERYSIPHE-ffi, Liv. 

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

 On living plants. Mycelium superficial, consisting of 



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 ColeosporiUm. 



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. 



The very abundant mycelium consists" of numerous slender, 

 vrhite 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 themselves enter it.* They send out at 

 intervals, however, short special branches called haustoria, that 



* It is held by some writers that in Sphserotheca pannosa, L^v., the 

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

 satisfactorily proven. 

 1. 



