194 



MYCOLOGY 



Fig. 68.— Portion of a. teliosorus of cedar apple in February showing mycelia 

 stroma and the binucleate condition of the cells of young teliospores. (After Reed. 

 H S , and Crabill, C. H., Techn. Bull. 9, Va. Agric. Exper. Slat., May, 191S-) 



basidiospores 



teleutospore 



uredospore. 



uredospore 



secidiospore 

 intercalary cell 



spermatium 

 s gamete 



¥ gametes 



fusion-cell 



Fig. 69. — Diagram of the alternation of generations of a typical rust. (After Grove, 

 W. B., The British Rust Fungi, 1913, 27.) 



