3 



Schulzeria. Volva and annulus wanting. 



dd) Stipe fleshy or fibrous and elastic ; hymenophore confluent with 

 the stipe and of the same texture. 

 ARMILLARIA. Annulus usually present (sometimes vague), volva wanting; gills 



attached to stipe. 

 TRICHOLOMA. Annulus and volva wanting ; gills sinuate. 

 CLITOCYBE. Annulus and volva wanting ; gills decurrent, not sinuate. 



ddd) Stipe cartilaginous ; hymenophore confluent with the stipe but 

 of a different texture, 

 e) Gills not decurrent. 

 COLLYBIA. Margin of the pileus at first involute, pileus flat or nearly so, 

 somewhat fleshy (some plants rather tough and tending toward the con- 

 sistency of Marasmius.) 

 MYCEN A. Margin of the pileus at first straight ; pileus slightly bell-shaped, thin. 

 HIATULA. Gills usually free ;. pileus deeply plicate, so that the gills are split 

 where they are attached to the pileus ; pileus membranaceous, very tender 

 but not diffluent. 



ee) Gills decurrent. 



OMPHALIA. Pileus umbilicate, somewhat fleshy and membranous. 



cc) Excentricae. Stipe on one side of pileus or none (rarely some spe- 

 cies with stipe subcentral). 



PLEUROTUS. Stipe when present continuous with the hymenophore. 



bb) Gills broadened toward the pileus, substance of the pileus passing 

 unchanged into the trama of the gills, so that when the gills are 

 pealed from the pileus ridges remain which are pulled out from 

 the trama of the gills. 



HYGROPHORUS. Gills waxy ; plant fleshy. 



aa) Trama of the pileus subvesiculose, plants rigid but fragile. 

 LACTARIUS. Gills where bruised exuding a milky or colored juice ; spores 

 globose, echinulate. 



RUSSULA, gills not juicy ; spores globose, echinulate. 



AA) Edge of the gills obtuse, or gills fold-like or vein-like, but prominent. 



CANTHERELLUS. Gills decurr£nt, dichotomous, somewhat waxy. 



Arrhenia. Gills very delicate, veniform, simple, not decurrent (plants sometimes 



cup-shaped with veins on upper side, should not be confused with Phlebia 



in the Hydnaceae). 



Rimbachia. Erect, pezizae-form, hymenium smooth, gills reticulate radiating 

 from the center, situated on the upper surface of pileus, external layer sterile 

 continuous with the stipe. (Sacc. XI, 32). ' 



Campanella. Related to Marasmius and Arrhenia, but hymenium subreticulate 

 with veins and ribs anastomosing below, spores pale, subglobose (Beiblatt 

 zur Hedw. XXXV, 3). 



NYCTALIS. Gills quite thick, obtuse, not decurrent. 



Stylobates. Gills thin, gelatinous, entirely covering the clavate stipe. 



