CONTENTS 



Preface 



CHAPTER I 



Introduction 



Bibliography 3 



CHAPTER II 



4 

 Woroninaceae 



Woronina 



Pyrrhosorus 



1 »> 

 Ro/.ellopsis 



CHAPTER III 



Ectrogellaceae 



Ectrogella 17 



Eurychasma 22 



Eurychasmidium 



Aphanomycopsis 



CHAPTER IV 



0-1 



Olpidiopsidaceae 



Olpidiopsis 31 



Development of thalli and zoosporangia 33 



Resting spore development and sex differentiation 38 



Cellular relations between host and parasite 40 



Parasites of Sa prolcyiiiu ** 



Parasites of Aehlya i5 



Parasites of Aphanomycet "*' 



Parasites of I'ifthiiim *' 



Parasites of algae *° 



Parasites of cryptogams and insects , - 



Pseudolpidium 



Pseudosphaerita 



Blastulidiopsis 58 



Pythiella 58 



vii >7559 



