PLATE 3 
Pyrenophora teres 
A. —Portion of barley culm as found occurring near Madison, Wis., April 15, 1919, 
showing numerous erumpent perithecia. X 2. 
B. —Perithecium bearing pointed setae near base, and an abundance of flexuous 
conidiophores on upper surface. X115 • 
Ca.—Seta from pe dthecium. X500. 
Cb-c.—Conidiophores from perithecium. X500. 
D.—Four asci showing imperfect development of ascospores, and pseudoparenchyma 
surrounding them. X500. 
