86 British UredinecE and UstilaHnecs-. 



observed. The spores collected in June germinated in 

 December, after being placed in water from three to five 

 days. 



TJiecaphoi'ci. — The germination of T. hyalina has been 

 investigated by Woronin.* He found that spores collected 

 in August germinated in October and November, after 

 fourteen to eighteen days' maceration in water, but older 

 spores did not germinate at all. Each spore is provided 

 with a germ-pore in the epispore, which is pale in colour 

 and free from any of the verrucosities which occur upon 

 the other parts of the epispore. Every germ-tube becomes 

 filled with protoplasm, and generally contains four nuclei. 

 It becomes septate, and each compartment contains one 

 of the nuclei. From each segment of the promycclium 

 narrower lateral branches are given off. Those from the 

 upper compartments tend to grow downwards, while those 

 from the lower, on the contrary, grow upwards. If one 

 of the upper branches comes in contact with one of the 

 lower, they unite at their ends and form a bow-like conju- 

 gation. From this a long germ-tube is given off, into the 

 end of which the protoplasm is passed. No spore-formation 

 was observed. 



I have made many attempts, but have always been 

 unsuccessful in getting the teleutospores of this species to 

 germinate. 



Brefeld,! in an allied species {T. latJiyri, KUhn), found 

 promycelia, at the end of which spherical promycelial spores 

 were formed. These promycelial spores in nahrlosung 

 germinated and produced a mycelial mass, which in turn 

 also produced spores upon those of its branches which 

 came in contact with the air. 



Tilletia. — The germination of Tilletia tritici has been 



* Woronin, loc. cit., pp. 21, 22, t. iii. figs. 19-28. 

 t Brefeld, loc. cit., pp. 134-138, t. xi. figs. 2-12, 



