Germination of TelciUospores of Ustilagiiicce. S3 



along to its growing end. Frequently two promycelial 

 spores become united by a transverse bridge (conjugation) ; 

 one of them then gives off a germ-tube, as in the case of 

 single promycelial spores, only it is longer. 



U. grandis. — In 1876, Kiihn* investigated the germina- 

 tion of this species. He found that the promycelia, which 

 are about from 50 to 6o}i long, and from 5 to 8/f wide, had 

 a great tendency to fall off from the teleutospores before 

 they produced promycelial spores, although this was not 

 by any means always the case. Brefeld f found in nahrlo- 

 sung that the promycelia were not only larger, but produced 

 more and also larger promycelial spores. These sporidia 

 not only reproduced themselves, but also grew into sporo- 

 phores {Fruchttrdger), which were indistinguishable from 

 the original promycelia, inasmuch as they were cylindrical 

 septate tubes, which in their turn budded off spores. Thus 

 colonies of yeast-cells do not occur in the life-cycle of 

 U. grandis any more than they do in that of U. longissivia. 

 With U. grandis the promycelium produces spores which 

 grow out into sporophores, and they in their turn produce 

 spores again. These sporophores are multicellular. 



U. bromivora, Tul.J — In water each spore produces a 

 small promycelium through a minute opening in the 

 epispore, very much after the manner of U. longissima. 

 This bears terminally a spore which soon falls away. 

 Between the fallen-off spores conjugations are frequently 

 to be seen ; sometimes they become uniseptatc and buckle- 

 jointed. In nahrlosung the typical germination takes place 

 in the production of single promycelial spores from a short 

 promycelium. These spores increase in size and become 

 uniseptate, or, as Brefeld term.s them,§ biccllular sporo- 



* Kiihn in Rabenhoist "Fungi Europsei," cent, xxiii. No. 2299, fig. 



t Brefeld, loc. cit., pp. 1 16-123, t. ix. figs. 17-26. 



X C/. Kiihn, "Vortrages iiber Getreidebrand." 1874. 



§ Brefeld, loc. cit., pp. 123-129, t. x. figs. 2-8. 



