PLATE 9 
Pyrenophora bromi 
A. —Old leaf of Bromus inermis of growth of preceding season as collected near 
Madison, Wis., May i, 1920, showing scattered mature perithecia of P. bromi. 
B. —Perithecium of P. bromi, showing wide ostiolar beak, with scattering setae. 
X 155- 
C. —Twenty-five day old potato agar culture of P. bromi, showing sclerotia partly 
covered with white mat of aerial mycelium. 
D. —Ascus of P. bromi after some swelling due to absorption of water, preliminary 
to spore discharge. X 500. 
E. —Ascospore of P. bromi germinating in water. 
Pyrenophora teres 
F. —Submerged mycelium of P. teres from 5-day old water-agar culture, showing 
relatively small complexes of inflated hyphal segments. X 500. 
