Germination of Tclcutosporcs of UstilagineiS. 79 



immersion in water. The process has been described and 

 figured by Tulasne * and Von Waldheim.f Brefeld % found 

 the production of tlie yeast-cell colonies was very prolific 

 in nahrlosung, where they multiplied themselves through 

 endless generations, whereas in water no budding took 

 place after the second day. These yeast-spores are ovate, 

 but somewhat elongated ; from 5 to 7^ long, and from 3 

 to \ii wide. The germinative faculty lasts for about six 

 weeks. The spores in water or in exhausted nahrlosung 

 frequently unite in the same manner as those of U. 

 segetum. 



When this fungus attacks the anthers of LycJinis diunia, 

 a plant which is usually unisexual, the styles which would 

 normally be .short, acute, and erect, become long and 

 recurved, as they are in the female flower. This has been 

 pointed out by M. Cornu, as well as by other observers. 



U. inaydis. — The germination of these spores was 

 observed by Kiihn § and Wolff,|| and does not materially 

 differ from the above : the yeast-spores,ir however, are 

 elongated and fusiform, being from 10 to 36/x long, and 

 from 3 to 5/i wide. 



U. scahioscB (Sow.) ( U. flosculornni). — The spores germi- 

 nate very freely and very soon in water. According to 

 Schroter ** the promycelia are three or four-partite ; about 

 from 20 to 22/x long, and 4/x wide ; the promycelial 

 spores are about 4// long. In nahrlosung Brefeld ff found 

 the yeast-spores to be from 4 to 8^ long, and from v^ 

 to 2\x wide. They were produced continuously and 



• Tulasne, " i" Memoire," t. iv. fig. i8. 



t F. von Waldheim, loc. cit., t. xii. 



X Brefeld, loc. cit., pp. 36-54, t. i. figs. 1-27. 



§ Kuhn, "Krankh d. Kulturgevv." p. 260, t. iii. figs. 22, 23. 



II Wolff, "Brand des Getreides," p. 11 t. i. fig. c. 



^ Brefeld, loc. cit., pp. 67-75, *• i^. figs. 1-17. 

 ** Schroter, " Cohn Beitrage," vol. ii. 1877 

 tt Brefeld, loc. cit., pp. 78-81, t. v. figs. 1-6. 



