THE FUNGI. 



135 



which is very destructive to salmon. These plants closely 

 resemble Vaucheria in the process of reproduction, both 

 sexual and asexual. The alternation of generations is 

 well marked. The plant AMya prolifera is a type. It 

 may be easily raised by placing dead flies in water. 1 



Fio. 74. Water Mold, a, end of filament, showing the partition cutting 

 off the protoplasm near the end from the rest of the filament ; b, same, 

 with protoplasm divided into escaping zoospores; c, zoospores inside a 

 filament ; d, filament showing oogonium and antheridium ; e, filament after 

 fertilization of oogonium. Magnified. 



After a few days, transparent or whitish branched fila- 

 ments grow from various parts of their bodies. In gen- 

 eral outline the tubular partitionless filaments resemble 

 1 Arrange Practical Studies of this plant. 



