CONTENTS 
PAGE 
Introduction . 3 
General key to the orders and families. 6 
Plasmodiophoreae. 7 
Acrasieae. 8 
Myxomycetae.•. . 8 
Ceratiomyxaceae . 8 
Myxogasterae..*. 8 
Physarales. 8 
Stemonitales.• . 26 
Liceales. 33 
Trichiales. 39 
Plates. 50 
Index 
70 
