Entoloma.
Gills decurrent Clitopilus.
_C._ Stem eccentric or none, pileus lateral Claudopus.
Gills decurrent, pileus umbilicate Eccilia.
Gills not decurrent, pileus torn into scales,
and slightly convex, margin at first involute Leptonia.
Pileus bell-shaped, margin at first straight Nolanea.

III. Spores rusty-brown or yellow-brown.
_A._ Stem not cartilaginous,
_a._ Stem central,
With a ring,
Ring continuous Pholiota.
Veil arachnoid,
Gills adnate, powdery from spores Cortinarius.
Gills decurrent or adnate, mostly epiphytal Flammula.
Gills somewhat sinuate, cuticle of the pileus
silky, or bearing fibrils Inocybe.
Cuticle smooth, viscid Hebeloma.
Gills separating from the hymenophore and
decurrent Paxillus.
_b._ Stem lateral or absent Crepidotus.
_B._ Stem cartilaginous,
Gills decurrent Tubaria.
Gills not decurrent,
Margin of the pileus at first incurved Naucoria.
Margin of pileus always straight,
Hymenophore free Pluteolus.
Hymenophore confluent Galera.
Gills dissolving into a gelatinous condition Bolbitius.

IV. Spores purple-brown.
_A._ Stem not cartilaginous,
Pileus easily separating from the stem,
Volva present, ring wanting Chitonia.
Volva and ring wanting Pilosace.
Volva wanting, ring present Agaricus.
Gills confluent, ring present on stem Stropharia.
Ring wanting, veil remaining attached to margin
of pileus Hypholoma.
_B._ Stem cartilaginous,
Gills decurrent Deconia.
Gills not decurrent, margin of pileus at
first incurved Psilocybe.
Margin of pileus at first straight Psathyra.

V. Black spored mushrooms.
Gills deliquescent