I 



1 86 MORPHOLOG Y. 



ing the oogonium, and the male nucleus fusing with the female nucleus 

 in fertilization. The sexual organs of Phytophthora infestans are not 

 sufficiently known. 



399. Mucor, saprolegnia, peronospora, and their relatives have few or 

 no septa in the mycelium. In this respect they resemble certain of the algae 

 like vaucheria, but they lack chlorophyll. They are sometimes called the 

 alga-like fungi and belong to a large group called Phycomycetes. 



