xx CONTENTS 



PAGE 



Leptolegniella 840 



Protoachlya 840 



Achlya 841 



Aphanomyces 843 



Sommerstorffia 844 



Plectospira 845 



Aplanes 846 



Thraustotheca 846 



Calyptralegnia 847 



Aphanodictyon 847 



Dictyuchus 848 



Brevilegnia 848 



Geolegnia 850 



?Hamidia 850 



?Aplanopsis 851 



Leptomitales 852 



Development and Morphology: The Thallus — Repro- 

 duction — Cytology — Physiology 



Systematic Account 871 



Leptomitaceae 872 



Leptomitus 873 



Apodachlya 874 



Apodachlyella 881 



Rhipidiaceae 882 



Sapromyces 883 



Araiospora 887 



Rhipidium 893 



Mindeniella 901 



Lagenidiales 904 



Development and Morphology: The Thallus — Repro- 

 duction — Parasitism 



Systematic Account 919 



Olpidiopsidaceae 921 



Rozellopsis 922 



Olpidiopsis 926 



