cap is even, smooth,
or slightly wrinkled (Thelephorei).

Section B is divided into two classes:

I. Plants club-shaped and simple, or bush-like and branched
(Clavariei).

II. Plants gelatinous and irregular (Tremellinei).

SECTION A.

Class I. Key to Gill-bearing Mushrooms (_Agarics_).

1. Plants fleshy, soon decaying, 2.
Plants leathery, woody, persistent, 12.

2. Juice milky, white, or colored, Lactarius.
Juice watery, 3.

3. Stem central, or nearly so, 4.
Stem lateral, eccentric or wanting, 11.

4. Spores white, 5.
Spores rosy, pink or salmon color, 15.
Spores yellowish-brown, ochre color, 17.
Spores dark brown, 21.
Spores black, 24.

5. With volva and ring, Amanita.
Volva and no ring, Amanita
(sub-genus Amanitopsis).
Ring and no volva, 6.
No ring and no volva, 7.

6. Gills free, ring movable, pileus scaly, Lepiota.
Gills adnate, pileus generally smooth, Armillaria.

7. Gills thin, edge acute, 8.
Gills in the form of folds, obtuse edge, 10.

8. Gills decurrent or stem fleshy. Clitocybe.
Gills sinuate, notched behind, stem fleshy, Tricholoma.
Gills adnate, not decurrent, stem cartilaginous, Collybia.
Stem fleshy, cap often bright color, 9.

9. Plants rigid, gills even, cap bright, Russula.
Plants with waxy gills, Hygrophorus.

10. Gills decurrent, plant terrestrial, Cantharellus.

11. Spores white, Pleurotus.
Spores yellowish or brown, Crepidotus.

12. Gills serrated on their edges, stem central or
lateral, Lentinus.
Gills entire, stem central, 13.
Stem lateral or wanting, 14.

13. Gills simple, pileus dry, soon withering,