412 PLANT DISEASES 



aecidia often forming concentric rings, crowded on rounded, 

 reddish spots, peridia shortly cyhndrical, margin white, 

 torn ; spores 10-20 /a, 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 IX ; pedicel rigid, persistent. 



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

 tab. 3, f. 3 (1797). 



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 fx diam. ; spermogonia on opposite side of leaf to 

 the aecidia. 



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

 long, or sometimes much longer ; uredospores broadly 

 elliptic, dingy yellow, spinulose, 17-40 X 14-22 [x. 



III. 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 fx. 



Puccinia coronata, Corda, Icon. Fufig., 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 /^. 



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



