HARDWICKE'S SCIENCE-GOSSIP. 



253 



at one time supposed to belong to different genera, 

 as Uredo and Pticcmia, are now considered to be 

 different stages of the same plant. In the two 

 examples given, the former generally appears first, or 

 in some instances the two forms are to be met with 



cetes, includes the plants popularly known as 

 " moulds ; " the vegetative partis well developed, the 

 threads being either combined into a common stem, 

 the tips remaining free, and giving origin to the 

 spores (fig. 163) or the filaments remain altogether 



Fig. 157- 



Fig. '158. 



Fig- 159- 



Fig. 160. 



in the same pustule, as the little heaps of spores are 

 called. Again, many supposed species are said — with 

 more or less proof — to be stages of the ascigerous 

 fungi. "Rust," "mildew," and "smut," are local 

 names for these minute pests. 



The last family of the Sporifera, called Hyphomy- 



Fig. 163. 



I 



Fig. 164. Fig. 165. 



free, when they are called hypha. The spores are 

 often arranged in a moniliform manner, the one 

 nearest the tip of the generating thread being the 

 youngest ; these strings of spores eventually break up. 

 Here again, many that at one time were supposed to 

 be autonomous, are regarded as stages of other fungi. 



