ANALYTICAL KEYS 309 



THE WHITE-SPORED AGARICS. 



(Sometimes there is a faint tinge of pink or lilac when the spores are in bulk, 

 but the color is not seen under the microscope.) 



Plants soft, fleshy or nearly so, usually soon decaying; 



dried plants do not revive well when moistened. . . . i 

 Plants tough, either fleshy or gelatinous, membranaceous, 

 corky or woody, persistent, reviving when moistened. . 13 



I Gills acute on the edge. 2 



Edge of the gills obtuse, or gills fold-like, or vein-like, but 



prominent 12 



2 Trama of the pileus of interwoven threads, not vesiculose. 3 

 Trama of the pileus vesiculose, plants rigid but quite 



fragile '. .' 11 



3 Gills thin, not much broadened toward the pileus. ... 4 



Gills broadened toward the pileus, of waxy consistency. . Hygrophorus. . no/ 

 4 Stipe central or sub-central. (Some species of Pleurotusare 

 sub-central, but the gills are usually not decurrent.) . . 5 

 Stipe on one side of the pileus, or none, rarely with the 

 stipe sub-central. (Some species of Clitocybe are sub- 

 central.) Pleurotus. . . 102 



S-Stipe fleshy, pileus easily separating from the stipe, gills 



usually free 6 



Stipe fleshy or fibrous and elastic, pileus confluent with the 



stipe and of the same texture. 7 



Stipe cartilaginous, pileus confluent with the stipe, but of 



a different. texture .9 



6 Volva and annulus present on the stipe Amanita. . . 52 



Volva present, annulus wanting Amanitopsis. . 74 



Volva wanting, annulus present Lepiota. . . 'j-j 



7 Annulus and volva wanting. 8 



Annulus usually present (sometimes vague), volva want- 

 ing, gills attached to the stipe -. Armillaria. . . 83 



8 Gills sinuate Tricholoma. . 87 



Gills decurrent, not sinuate Clitocybe. . . 89 



9 Gills decurrent, pileus umbilicate Ompbalia. . . 100 



Gills not decurrent 10 



10 Margin of pileus at first involute, pileus flat or nearly so, 

 somewhat fleshy (some plants rather tough and tend- 

 ing toward the consistency of Marasmius) Collybia. . . 92 



Margin of the pileus at first straight, pileus slightly bell- 

 shaped, thin. Mycena. . . 93 



Gills usually free, pileus deeply plicate so that the gills are 

 split where they are attached to the pileus, pileus mem- 

 branaceous, very tender but not diffluent Hiatula. 



U Plants where bruised exuding a milky or colored juice. .- . Lactarius. . .114 



Plants not exuding a juice where bruised Russula. . . 125 



12 Gills decurrent, dichotomous, edge blunt Caitharellus. 128 



Gills not decurrent, plants parasitic on other mushrooms. . Nyctalis. 



