FUNGI : SAPROLEGNIA. 



183 



Fig. 199. 

 Fertilization in saprolegnia, tube of antheridium carrying m 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.) 



Branching hj-pha of Peronospora alsinearum, 



Branched hypha of downy mildew 

 of grape shoeing peculiar branching 

 (Plasmopara viticola). 



