■3 



Stem fleshy or fibrous-elastic and homogeneous with the substance 

 of the pileus ....:.. Clitocybe 



Stem cartilaginous, not homogeneous with the pileus ; pileus 

 fleshy-membranaceous, usually umbilicate and smaller than in 

 Clitocybe ........ Omphalia 



-)--<- Lamellae not decurrent. 



Stem fleshy, homogeneous with substance of the pileus ; lamellae 

 sinuate ........ Tricholoma 



Stem cartilaginous, not homogeneous with substance of pileus ; 

 margin of pileus inrolled when young . . Collybia 



Stem cartilaginous \ pileus campanulate, margin straight from the 

 first. The species are usually small and delicate Mycena 



** Stem, when present, eccentric or lateral . . P/euroius 



B. More or less coriaceous or even corky, not putrescent, after dry- 

 ing up reviving again on becoming moist. 



Stem distinct from the substance of the pileus ; pileus fleshy-tough 

 or membranaceous-coriaceous .... Marasmius 



Stem continuous with substance of the pileus ; lamellae with ser- 

 rate edge ........ Lentinus 



Stem continuous with substance of the pileus ; lamellae with edge 

 thin and entire . . . . . . . Partus 



Stem obsolete ; lamellae resembling folds and with edge crisped 



Trogia 



Corky ; lamellae with edge thin and acute, sometimes simple, 

 sometimes anastomosing behind and passing into polyporoid 

 forms ........ Lenzites, 



Coriaceous, sessile ; lamellae with edge split lengthwise and with 

 the separated portions revolute . . . Schizophyllum 



Sect. 2. Rhodosporeae. 

 All the species of this section are fleshy and putrescent. 



A. Stem normally central in attachment to pileus , . a & b 



a. Lamellae free. 



Stem with a volva but lacking an annulus . . . Volvaria 



Stem lacking both volva and annulus . . . . Pluteus 



b. Lamellae not free 



