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 Crahill, C. H., Techn. Bull, g, Va. Agric. Exper. Stat., May, IQ15.) 



teleutospore 



basidiospores 



uredospoTe. 



SPOEOPHYTE 



(2?i generation) 



uredospore 



aecidiospore 

 intercalary cell 



GAMETOPHYTE 



(n generation) 



spermatium 



$ 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.) 



