THE FUNGI : ASCOMYCETES AND BASIDIOMYCETES 305 



Fig. 298. — Pucciuia gianiinis. Section of Wheat leaf \\ ith mature 



teleutosori. 



Fig. 299. — Pucciuia gramivis. 

 Germination of teleuto- 

 spore to produce two 

 four-celled basidia which 

 give rise to basidiospores. 



Pycnidium 



Pycnospores 



Aeadiun: 



\ 



Basidiospores 



Uredospores 



leleutospores 



J. 



Aecidiospores 



•Uredosorus ' 

 Fig. 300. — Life-cycle oi Piiccinia graminis. 



Te/eutosorus 



II 



