USTILAGO. 



295 



sisting of three or four cells with conidia, and sometimes 

 secondary conidia. Coalescence of conidia may take place, and 

 thereafter production of little mycelial threads. In nutritive 

 solutions everything proceeds more luxuriantly, and conidia are 

 produced in large numbers ; they are easily detached and sprout 



Fig. 161,~Ustitago tragopogonis. Plants of Tragopogon in flower and fruit — 

 1, normal fruit ; 2 and 3, normal flowers ; 4, two normal flower-buds. The 

 remaining specimens are attacked by the fungus, and, in consequence, remain 

 in the bud condition, and filled with black spores which escape by the opening of 

 the inTolucre. (v. Tubeuf phot.) 



yeast-like, till, on deficiency of nutrition, fusion and subsequent 

 germination takes place. 



Ust. intermedia Schroet. (Vst. flosculorum D. C.) (Britain). 

 The anthers of Scabiosa Columbaria become filled with the dark 

 violet spores of this smut. The spores germinate in water, 

 and, according to Brefeld, produce three-celled promycelia with 

 few conidia ; some of these, as well as the cells of the promy- 



