FUNGI IMPERFECTI SEPTORIA 



285 



Fig. 102. 1. Leaf of Cheat, showing numerous small specks, the perithecia of 

 Septoria Bromi, the spores in the perithecia shown at 2. 



In a somewhat extended account of this disease Cobb states that the 

 entire plant is not always involved. The fungus is variable, its character 

 depending upon the host which it attacks. On Poa annua the leaf is mainly 

 involved and in many cases is totally destroyed. Cavara states that the spots 

 on the leaves are small, elliptical, red or yellow, or the latter may be entirely 

 absent. The injury it does to young plants is very great; in some cases their 

 total destruction has been observed. 



