474 Proceedings of the Ohio State Academy of Science. 



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

 when moistened. 

 B.^ Stipe eccentric, lateral or wanting. .. .Pleurotus C513) 

 B.- Stipe central or subcentral. 



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

 like. 

 D.^ Lamellae decurrent, usually dichotomous. 



Cantharellus (531) 

 D.- Lamellae not decurrent; plants parasitic ort 



other Hymenomycetes Nyctalis (532) 



C.^ Edge of lamellae acute. 



D.^ LIniversal veil membranous, usually leaving a. 

 volva at base of stipe, or more rarely break- 

 ing up into patches or scales which are evident 

 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 fibers). 

 G.^ 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 pileus and of 

 same texture. 

 I.^ Lamellae sinuate. 



Tricholoma (492) 



