72 British Uredinee and Ustilaginee. 
CHAPTER X. 
GERMINATION OF THE TELEUTOSPORES OF THE 
USTILAGINE:, 
ArT the beginning of the present century, Prevost * discovered 
the fact that the spores of U. segetum and T. tritici, 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,t 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,f Kiihn,** and others. 
Little additional light had been thrown upon the subject, 
* Prevost, B., ‘‘ Mém. sur la cause immédiate de la Carie.” Montauban; 
1807. g 
+ De Candolle, ‘‘ Physiol. Veget.” (1832), vol. iii. p. 1436. 
+ In 1835 referred to by Tulasne, ‘‘ 1° Mémoire,” p. 38. 
§ Berkeley, ‘‘ Propagation of Bunt,” Trans, Hort. Soc. London (1847), 
vol. ii. p. 113. 
| Tulasne, ‘‘Mém. sur les Ured, et Ust.,” dan. de Sct. Nat., 4° sér., 
tome ii. p. 113. 
{ Bonorden, ‘‘ Handb, d. Allg. Mykologie” (1851), p. 39. 
** Kiihn, ‘Krank, Kult.,” 2 aufl, 1859. 
