1902] STUDIES IN THE FERTILIZATION OF PHYCOMYCETES 425 



Fig. 3. Zonation ; mitosis completed ; one daughter nucleus remaining 

 with coenocentrum, the other passing to periplasm. 



Fig. 4 . Fertilization ; antheridial tube ruptured, emptying one nucleus into 

 oosphere ; female nucleus resting in coenocentrum. 



Fig. 5, Oospore wall forming; periplasm and periplasmic nuclei degen- 

 erating ; remains of autheridium and trace of the tube in periplasm. 



Fig. 6. Winter condition. 



Fig. 7. Pronuclei just before fusion. 



