Table of Contents 



INTRODUCTION 



History 1 



A Proposed Synopsis 4 



GENERAL CONSIDERATIONS 



Characters 7 



Macroscopic Characters: Pileus, 7; Lamellae, I J; Stipe, 12 



Microscopic Characters: Spores, 14; Basidia, 16; Cystidia, 17; 

 Gill Trama, 20; Pileus Context and Cutis, 22; Clamp Con- 

 nections, 29 



Chemical Characters, 31 



Ecological Considerations 32 



Geographic Considerations 34 



Seasonal Occurrence 36 



Phylogeny and Classification 37 



Materials Studied 42 



Doubtful and Excluded Species 44 



CLASSIFICATION OF HYGROPHORUS FRIES 



Key to Subgenera, page 46 



SUBGENUS PSEUDOHYGROPHORUS 47 



SUBGENUS HYGROPHORUS 48 



Section Camarophyllus 48 



Subsection Camarophyllopsis, 49 



Series: Virginei, 49; Viscidi, 61; Camarophyllopsis, 69 



Subsection Microspori, 82 



Series: Microspori, 83; Pelliculosi, 93 



Section Hygrotrama 96 



Section Hygrocyre 107 



