CONTENTS xxi 



PAGE 



?Pseudolpidium 955 



Petersenia 957 



Pseudosphaerita 961 



?Blastulidiopsis 964 



SlROLPIDIACEAE 965 



Sirolpidium 965 



Pontisma 970 



Lagenidiaceae 972 



Myzocytium 973 



Lagenidium 982 



?Lagenidiopsis 1010 



Peronosporales 1012 



Development and Morphology: The Thallus— Repro- 

 duction 



Systematic Account 1023 



Pythiaceae 1024 



Zoophagus 1025 



Pythium 1031 



Pythiogeton 1042 



Diasporangium 1050 



Phytophthora 1051 



Entomophthorales (Ancylistes) 1061 



Development and Morphology: The Thallus— Repro- 

 duction 



Systematic Account 1064 



Entomophthoraceae 1064 



Ancylistes 1065 



List of Substrata 1073 



Bibliography 1105 



Index H65 



