124 



MORPHOLOGY. 



ordinary threads of the mycelium. Some of the threads should 

 be mounted in fresh water, Search for some of those which 



Fig. 134- 



Sporangia of saprolegnia, one showing the escape of the zoogo- 

 nidia. 



show that the protoplasm is divided up into a great number of 

 small areas, as shown in fig. 134. 



With the low power we should watch some of the older ap- 

 pearing ones, and if after a few minutes they do not open, other 

 preparations should be made. 



282. Zoogonidia of saprolegnia. The sporangium opens at 



Fig. 135- 

 Branch of saprolegnia showing oogonia with oospores, eggs matured parthenogenetically. 



the end, and the zoogonidia swirl out and swim around for a 

 short time, when they come to rest. With a good magnifying 



