MICHIGAN ACADEMY OF SCIENCE. 
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9. Pileus thick, woody, corky or tough-fleshy, stalked or sessile. 
Poly porus. 
9. Pileus thin, leathery or membranous: (10) 
9. Pileus corky; tube-layer not distinct from trama of pileus v . . (11) 
10. Pileus stalked or sessile shelving. 
10. Pileus always entirely resupinate : 
Polystictus. 
Porta. 
11. Tubes somewhat round. 
11. Tubes sinuous-labyrinthiform. 
Trametes. 
DaedaUa. 
( Thelephoraceae . ) 
(k) Fruit-body infundibuliform and stalked, G anther ellus- like: hy- 
menium ridged on the exterior. Craterellus. 
(k) Fruit-body with even hymenium, but often showing the irregulari- 
ties of the uneven substratum (1) 
1. Hymenium with projecting, bristle-like cystidia, showing under a 
pocket-lens: (2) 
1. Hymenium without cystidia (4) 
2. Cystidia stellately branched : Asterostroma. 
2. Cystidia simple: • (3) 
3. Cystidia hyaline; fruit-body of a one layered trama. Peniopliora. 
3. Cystidia colored ; fruit body of more than one layer : Eymenochaete. 
4. Pileus with substance in differentiated layers; usually effuso-re- 
flexed, rarely stalked. Stereum. 
4. Pileus of a homogeneous substance (5) 
5. Pileus resupinate, effused over the substratum in thin crusts:. . (6) 
5. Pileus stalked, or resupinate-reflexed, often much branched to form 
compound pilei. Thelephora. 
6. Hymenium waxy or soft when fresh, cracked when old; spores 
colorless: Corticium. 
6. Hymenium fleshy; spores colored. Comophora. 
POLYPORACEAE. (Field Keys to Species). 
The important character 
comes first. 
Names in parenthesis are those of the North 
American Flora, by A. W. Murril, where 
descriptions may be found. 
Fomes. 
1. Hvmenophore flesli-color. . (2) 
1. Hvmenophore not truly flesh-color (3) 
2. Flesh rose-colored; pileus usually small, flesh color when fresh; 
tubes 1-2 mm. long: Fomes rosens Fr. 
