to 



FlG. 89 Puccinia graminis. i, wheat leaves with uredo pustules ; 

 2, a uredo sorus ; 3, uredospores in different stages of development ; 

 4, uredospore germinating ; 5, culm of wheat with teleutospore 

 sori ; 6, teleutospores in different stages of development ; 7, teleuto- 

 spore that has germinated and produced a germ-tube bearing three 

 sporidiola or secondary spores ; 8, barberry leaf with clusters of 

 aecidia ; 9, section of an aecidium with chains of aecidiospores ; 

 10, two aecidia ; n, spermatia from a spermogonium. Figs, i, 2, 

 and 8 reduced, remainder variously mag. 



