sis.
Pileus scaly, scales concrete with cuticle,
Volva wanting, ring present Lepiota.
Hymenophore confluent,
Without cartilaginous bark,
_b._ Stem central, ring present (sometimes vague),
Volva wanting, gills attached Armillaria.
Without a ring,
Gills sinuate Tricholoma.
Gills decurrent,
Edges acute Clitocybe.
Edges swollen Cantharellus.
Gills adnate,
Parasitic on other mushrooms Nyctalis.
Not parasitic,
Milky Lactarius.
Not exuding juice when bruised,
Rigid and brittle Russula.
Quite viscid, waxy consistency Hygrophorus.
_c._ Stem lateral or none, rarely central Pleurotus.
_d._ Stem with cartilaginous bark,
Gills adnate Collybia.
Gills sinuate Mycena.
Gills decurrent Omphalia.
Plants tough, fleshy, membranaceous, leathery,
Stem central,
Gills simple Marasmius.
Gills branched Xerotus.
_B._ Plants gelatinous and leathery Heliomyces.
Stem lateral or wanting,
Edge of gills serrate Lentinus.
Edge of gills entire Panus.
Gills fold-like, irregular Trogia.
Edge of gills split longitudinally Schizophyllum.
_C._ Plants corky or woody,
Gills anastomosing. Lenzites.

II. Spores rosy or salmon color.
_A._ Stem central.
Gills free, stem easily separating from pileus.
Without cartilaginous stem,
Volva present and distinct, no ring Volvaria.
Without a volva, with a ring Annularia.
Without a volva and without a ring Pluteus.
_B._ Stem fleshy to fibrous, margin of pileus at
first incurved,
Gills sinuate or adnate