412 PLANT DISEASES 



aecidia often forming concentric rings, crowded on rounded, 

 reddish spots, peridia shortly cylindrical, margin white, 

 torn; spores 10-20 p, orange; epispore hyaline, scarcely 

 wrinkled ; teleutospores forming sori on leaves or culms, 

 elongated, brown, pulverulent, blackish ; spores clavate- 

 oblong or oblong, apex much thickened, rounded, or 

 truncate; base often narrowed, smooth, brown, 35-50 X 

 15-20 fJL ; pedicel rigid, persistent. 



Puccinia graminis, Pers., Tent. Disp. Meth. Fung., p. 39, 

 tab. 3, f. 3 (i797). 



i. Diseased spots on the leaves 3-4 mm. diam., centre 

 red, margin yellowish, sometimes also formed on twigs, 

 flower, and fruit ; aecidia shortly cylindrical, margin 

 spreading and torn ; spores subglobose, smooth, yellow, 

 14-26 //. diam. ; spermogonia on opposite side of leaf to 

 the aecidia. 



n. Sori forming yellowish, rust-coloured streaks 2-3 mm. 

 long, or sometimes much longer ; uredospores broadly 

 elliptic, dingy yellow, spinulose, iy-4ox 14-22 /*. 



in. Sori forming blackish streaks up to 10 mm. long, 

 often much shorter ; teleutospores fusiform or club-shaped, 

 with a long pedicel, slightly constricted at the septum, 

 smooth, chestnut-brown ; apex rounded or narrowed, with 

 the wall thickened, 35-60 X 12-22 p. 



Puccinia coronata, Corda, Icon. Fung., i. p. 6, tab. 2, 

 f. 96. 



i. Aecidia on irregular yellow patches on the under 

 surface of the leaves, especially along the nerve ; also 

 on the flower-buds and fruit ; aecidiospores spinulose, 



18-25 X 14-19 p- 



ii. Sori orange-red, narrow, and elongated, mostly on the 



