=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.= 77 =7=--=Annulus= and volva wanting. 8 =Annulus= usually present (sometimes vague), volva wanting, gills attached to the stipe. =Armillaria.= 83 =8=--=Gills= sinuate. =Tricholoma.= 87 =Gills= decurrent, not sinuate. =Clitocybe.= 89 =9=--=Gills= decurrent, pileus umbilicate. =Omphalia.= 100 =Gills= not decurrent. 10 =10=--=Margin= of pileus at first involute, pileus flat or nearly so, somewhat fleshy (some plants rather tough and tending 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 membranaceous, very tender but not diffluent. =Hiatula.= =11=--=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. =Cantharellus.= 128 =Gills= not decurrent, plants parasitic on other mushrooms. =Nyctalis.= =13=--=Edge= of gills not split into two laminæ. 14 =Edge= of gills split into two laminæ and revolute. =Schizophyllum.= 136 =14=--=Plants= leathery, either fleshy, membraneous, or gelatinous. 15 =Plants= corky or woody (placed by some in Polyporaceæ). =Lenzites.= =15=--=Stipe= separate from the pileus (hymenophore), easily separating. 16 =Stipe= continuous with hymenophore. 17 =16=--=Plants= tough and fleshy, membranaceous or leathery. =Marasmius.= 130 =Plants= gelatinous and leathery. =Heliomyces.= =17=--=Edge= of the gills acute. 18 =Edge= of the gills obtuse. 19 =18=--=Edge= of gills usually serrate. =Lentinus.= 134