20 THE CHICAGO ACADEMY OF SCIENCES 



8 Trama vesciculose, substance of pileus rigid- 



fragile _ 



9 Lamellae with a milky juice Lactarius. 



Lamellae juiceless, plant rigid and brittle. . .Russula. 

 Lamellae waxy when mature Hygrophorus. 



10 Stem lateral or wanting Pleurotus. 



1 1 Stem central: plants tough, fleshy or leatheryMarasmius. 



31 m lateral or wanting 12 



12 Lamellae serrate or eroded on the edge Lentinus. 



Lamellae entire Panus. 



Lamellae anastomosing Lenzites. 



Lamellae split longitudinally, the lamina.' 



revolute Schizophyllum. 



Spores Rosy, etc. 



13 Stem central 1-1 



E tern lateral, eccentric or none Claudopus. 



14 Stem flesh}-, separating easily from the pileus 1") 



15 With volva Volvaria. 



Without a volva Pluteus. 



16 Stem fleshy or fleshy-fibrous, confluent with 



the pileus 17 



17 Lamellae adnate or sinuate Entoloma. 



Lamellae decurreht Clitopilus. 



18 Stem cartilaginous: 



Lamellae slightly attached rLeptonia. 



Lamellae decurrent Lccilia. 



Spores Ochraceous, et< 



1!) Stem central '-'0 



Stem lateral or none Crepidotus. 



20 Stem fleshy, plant with an arachnoid univer- 



sal veil Cortinarius. 



Stem fleshy, without an arachnoid veil 21 



in cartilaginous 24 



21 Lamellae anastomosing Paxillus. 



Lamellae not anastomosing 22 



With an annulus Pholiota. 



Without an annulus '_':'> 



23 Lamellae subsinuate, surface of pileus silky 



or fibrillose Inocybe. 



Lamellae subsinuate. surface of pileus glab- 

 rous, viscid Bebeloma. 



Lamellae adnate or decurrent blanimula. 



24 Pilous fleshy, margin inflexed Naucoria. 



Pileus slightly fleshy, viscid, margin straight.. Pluteolus. 

 Pileus membranaceous, striate, margin 



straight Galera. 



3po - Bl \( K. ET( . 



2.") Spores with a brownish or purplish tint. . . . 26 



Spores black or nearly so 29 



