396 Illinois State Laboratory of Natural History. 



Figure 4. Erysiphe chicoracearum, 

 DC. A ruptured perithecium with 

 thread-like appendages and protrud- 

 ing asci, eacli containing two spores, 

 — magnified 90 times. 



^ 



Fig. 5. 



Figure 5. Uncinula am- 

 pelopsidis, Peck : a, perithe- 

 cium with the numerous 

 appendages (6) coiled at the 

 tip, — magnified 100 times ; c, 

 one of the appendages (tip) 

 further magnified; d, anas- 

 cus with five spores, — magni- 

 fied 200 times. The lower, 

 pointed end of the ascus is 

 attached to the bottom of 

 the cavity of the perithecium. 



Figure 6. Phyllactinia suf- 

 fulta, (Reb.) Sacc. : a, perithe- 

 cium with the needle-shaped 

 appendages (6) swollen at 

 base, — magnified 50 times ; c, a 

 branched appendage ; d, an 

 ascus with two spores, — mag- 

 nified 100 times. The point 

 (pedicel) of attachment is 

 shown. The appendages are 

 normally quite straight, but 

 are here shown as they ap- 

 peared under the microscope, 

 possibly mechanically bent. 



Fig. 6. 



