BLACK RUST OF GRAIN (PUCCINIA GRAMINIS) 399 



Fig. 356. — Stage of the Wheat Rust on the Barberry bush, Berberis 

 wlgaris. Left, leaf of Barberry, showing the affected areas which are red- 

 dish, much thickened, and contain many cup-like depressions; right, a very 

 much enlarged section through the affected area of the leaf, showing one of 

 the cvips (c) with chains of aeciospores ( X 200) . The very small spores at 

 (p) are the pycniospores. 



Fig. 357. — Diagram showing the life cycle of the Wheat Rust. A, wheat 

 plants; B, barberry bush; u, urediniospore; i, teleospore; s, basidiospores; 

 a, aeciospore. 



