THE AGARICACEAE OF TROPICAL NORTH 

 AMERICA— V 



William A. Murrill 



The tropical species with ochraceous or ferruginous spores are 

 treated in this article and the next following in the series. A 

 majority of these species occur on decaying wood. The generic 

 distinctions are not always clearly defined, the group being con- 

 sidered difficult for a beginner. 



pileus dimid- 



Lamellae readily separable from the context 



iate or resupinate. 

 Lamellae not readily separable from the contex. 



Volva and annulus absent ; veil present at times in young 

 stages, but evanescent. 

 Pileus centrally stipitate. 

 Stipe cartilaginous. 



Lamellae dissolving at maturity. 

 Lamellae not dissolving at maturity. 

 Lamellae free. 



Lamellae adnate or adnexed. 



Margin of pileus straight, from 



the first. 

 Margin of pileus at first inflexed. 



Stipe fleshy. 



Universal veil arachnoid, distinct from 



the cuticle ; lamellae adnate. 

 Universal veil not arachnoid. 



Lamellae sinuate or adnexed. 

 Pileus fibrillose or silky. 

 Pileus smooth and viscid. 

 Lamellae adnate or decurrent. 

 Pileus dimidiate or resupinate, 

 Volva absent, annulus present. 

 Pileus hygrophanous. 

 Pileus dry. 



Stipe glabrous or fibrillose. 

 Stipe squarrose-scaly. 



I. Tapinia. 



2. Mycena. 



3. Pluteolus. 



conocybe. 

 Naucoria. 



6. CORTINARIUS. 



7. I'NOCYBE. 



8. Heueloma. 



9. Ryssospora. 



10. Phialocybe. 



11. Pholiotina. 



12. Pholiota. 



13. Hypodendrum. 



I. Tapinia (Fries) Karst. Hattsv. 452. 1879 

 This genus includes the dimidiate or resupinate species of the 

 old genus Paxillus, in which the lamellae are usually readily sep- 

 arable from the pileus and anastomose with each other. 



72 



