FUNGI: SAPROLEGNIA. 



133 



Fig. 199. 



Fertilization in saprolegnia, tube of antheridium carrying in the nucleus of the sperm cell 

 to the egg. In the right-hand figure a smaller sperm nucleus is about to fuse with the 

 nucleus of the egg. (After Humphrey and Trow.) 



Fig. 200. 

 Branching hypha of Peronospora alsinearum. 



Fig. 201. 



Branched hypha of downy mildew 

 of grape showing peculiar branching 

 (Plasmopara viticola). 



