CONTENTS xix 



PAGE 



Rhizidiomycopsis 757 



Latrostium 758 



Hyphochytriaceae 759 



Hyphochytrium 760 



?Reessia 764 



BlFLAGELLATAE 768 



Plasmodiophorales 768 



Systematic Account 773 



Plasmodiophoraceae 774 



Woronina 775 



Octomyxa 782 



Plasmodiophora 783 



Ligniera 784 



Tetramyxa 785 



Sorodiscus 787 



Sorosphaera 790 



?Pyrrhosorus 790 



Saprolegniales 792 



Development and Morphology: The Thallus — Repro- 

 duction — Physiological Investigations 



Systematic Account 801 



ectrogellaceae 802 



Ectrogella 803 



Pythiella 812 



Eurychasma 814 



Eurychasmidium 820 



Aphanomycopsis 824 



Thraustochytriaceae 828 



Thraustochytrium 829 



Japonochytrium 832 



Saprolegniaceae 833 



Pythiopsis 835 



Saprolegnia 835 



Isoachlya 838 



Leptolegnia 839 



