8o British UrediiiecB and Ustilao-inecF. 



abundantly. As the teleutospores are of pretty large size, 

 their germination is easily observed. I have found them 

 germinate much more freely in summer than in late autumn 

 (Plate VII. Fig. i8). 



U. tragopogi (Pers.) i^U. receptactdoruvi, Fries). — The 

 germination was observed by Tulasne,* and by Von Wald- 

 heim.t to consist in the protrusion of a promycelium 

 through a very marked germ-pore in the epispore. It 



becomes three or four-septate, and pro- 

 duces subcylindrical promycelial spores, 

 which are rounded, especially at their 

 distal ends. These often grow nearly 

 parallel to the promycelium, as figured 

 by Von Waldheim ; sometimes they 

 are produced terminally upon branches 

 Fig. e.—Ustiiago trago- given off from the segments of the pro- 



/•ogi. Teleutospjre gerini- ° <-> i 



nating, and promycelial spores nivcelium. Coni'ugation oftcn takcs 



conjugating, (iulasne.) •.±tj^ j £> 



place between them after they have 

 fallen off. In nahrlosung Brefeld J found them to be abun- 

 dantly reproduced by budding, but they were larger, mea- 

 suring from 5 to 20^ in length, and from 5 to 7^ in breadth. 

 U. knhneana, Wolff. — The promycelium is three to four- 

 septate, the lowermost compartment being the longest 

 and empty. It produces numerous promycelial spores in 

 whorls at each septum (Plate VII. Fig. 17). In nahrlo- 

 sung § they budded very profusely, forming very character- 

 istic small yeast-spores, from 3 to 5^ long, and from 3 

 to 5|u wide. Wolff H also investigated the germination in 



water. 



U. /';//'^^/t'.f (Schlecht.).— The germination of this plant 



* Tulasne, "■ i' Memoire," pp. 159-160, t. xii. figs. 34-40. 

 t F. von Waldheim, loc. cif., t. xi. figs. 27-37. 

 X Brefeld, loc. cit., pp. 81, 82, t. v. figs. 7-1 1. 

 § Brefeld, loc. cit., pp. 83-88, t. v. figs. I2-20. 

 li Wolff, Bat. Zeitimg (iSj4), pp. 814, 815. 



