72 British Uredinecs and UstilaginecB. 



CHAPTER X. 



GERMINATION OF THE TELEUTOSPORES OY TFIE 



USTILAGINE/E. 



At the beginning of the present century, Prevost* discovered 

 the fact that the spores of U. segetum and T. tiHtici, when 

 placed in water, would germinate. He observed the pro- 

 cess in Tilletia to consist of the protrusion of a germ-tube 

 and the development upon it of primary spores, which 

 became united in pairs below, and which bore above the 

 secondary spores. His observations were confirmed by 

 De Candolle,t by Caron and Vandenhecke,| and by Mr. 

 Berkeley,§ and they have been accurately described and 

 delineated by almost all the more recent observers. With 

 U. segetum Prevost observed the germ-tube, and that it 

 gave off small secondary branches. His observations were 

 confirmed by Tulasne,|| Bonorden.lf Kuhn,** and others. 

 Little additional light had been thrown upon the subject, 



* Prevost, B., " Mem. sur la cause immediate de la Carie." Montauban : 

 1807. 



t De Candolle, " Physiol. Veget." (1832), vol. iii. p. 1436. 



X In 1835 referred to by Tulasne, " i"' Memoire," p. 38. 



§ Berkeley, "Propagation of Bunt," Trans. Hort. Soc. Lotidon (1847), 

 vol. ii. p. 113. 



II Tulasne, "Mem. sur les Ured. et Ust.," Ann. de Sci. Mi/., 4'' sen, 

 tome ii. p. 113. 



^ Bonorden, " Handb. d. Allg. Mykologie " (1851), p. 39. 



** Kiihn, " Krank. Kult.," 2 aufl. 1859. 



