474 Proceedings of the Ohio State Academy of Science. 



A.- Plants tieshy or somewhat so; soon putrescent, not reviving; 

 when moisteneel. 

 B.^ Stipe eccentric, lateral or \vanting. . . . Pleurotus (513)^ 

 B.- Stipe central or suhcentral. 



C.^ Edge of lamellae ohtuse ; lamellae thick or vein- 

 like. 

 D/ Lamellae decurrent, usually dichotomous. 



Cantharellus (,531) 

 D.- Lamellae not decurrent ; plants parasitic on. 



other tlymenomycetes Nyctalis (532) 



C.- Edge of lamellae acute. 



D.^ Universal veil membranous, usually leaving a. 

 volva at base of stipe, or more rarely break- 

 ing up into patches or scales which are e\'ident. 

 on surface of pileus. 

 E.^ Annulus present as a ring about the stipe. 



Amanita (480) 



E.' Annulus wanting Amanitopsis (482) 



D.- Volva wanting. 



E.^ Annulus present. 



F.^ Pileus confluent with stipe : lamellae at- 

 tached Armillaria (491) 



F.- Pileus distinct and easily separating 

 from stipe; lamellae usually free. 



Lepiota (482) 

 E.- Annulus wanting. 



F.' Trama floccose (of interwoven hVers). 

 C* Lamellae waxy, not easily splitting 

 into two layers. 



Hygrophorus (516) 

 G." Lamellae fleshy, readily splitting intO' 

 two layers. 

 H.^ Stipe fleshy or fibrous elastic, 

 confluent with pileu-^ and of 

 same texture. 

 L^ Lamellae sinuate. 



Tricholoma (492) 



