SPHAEROPSIDALES 391 



sici on tomato, S. apii on celery, S. avenue on oats, S. tritici and 

 5. nodonmi on wheat, S. secalis on rye, and 5. nibi on brambles. 

 Weber (1923) connected 5. avenae with Leptosphaeria avenaria, 

 and Roark (1921), 5. nibi with Mycosphaerella nibu 



Fig. 150. Pycnidium of Avierosporhim oecoiwviiciim, in vertical section 



of leaf of Vigua sinensis. 



Wojnoivicia gravnnis is wide-spread in Australia, northwestern 

 Europe, and the Great Plains area of North America as a weak 

 parasite on fall-sown cereal crops and certain other grasses 

 [Sprague (1935)]. 



In Europe, Japan, and parts of the United States where snow 

 lies deeply over grain fields and melts late in the spring, the young 

 plants may be covered with a moldy growth. The tissues of in- 

 jured plants contain small dark sclerotia, identified as species of 

 Sclerotium. In reality these sclerotia are stages of Typhula, 



