22S 
THIRTEENTH REPORT. 
2. Flesh flesh-color to cork-color; pileus 5 to 20 cm. wide; tubes 3-5 
mm. long. Fomes fraxinens Fr. 
3. Fruit-body mostly resupinate or effuso-reflexed (4) 
3. Fruit-body usually shelving, dimidiate, ungulate or applanate. (5) 
( dimidiate = semicircular ; ungulate = hoofed-shaped ; applanate 
= flatly-extended) . 
4. Flesh thick, white or whitish ; surface of pileus velvety, usually 
covered with a green growth of Moss, etc.; tubes 1-2 mm. long. 
Fomes connatus Fr. 
(Fomes populinus). 
4. Flesh cinnamon-brown, thinner; fruit-bodv widely effused and re- 
supinate (i. e. with hymen ium uppermost). Fomes conchcUus Fr. 
(Pyropolyporus conchatus) . 
5. Pileus small,- less than 3 cm. wide; flesh whitish (6) 
5. Pileus often considerably larger: (7) 
G. Pileus ungulate, zonate and concentrically silicate in age. 
Fomes ohiensis Berk. 
(See also Trametes) 
G. Pileus scutellate, (platter-shaped) ; surface even and black. 
Fomes scutellatus ScKw. 
7. Flesh white or whitish; ( Fomes pinicola is brownish in age) . . (8) 
7. Flesh brown to ferruginous (rust-color) (11) 
8. Surface of pileus chalk-white, or dingy white; on conifers, mostly 
Larix : Fomes officinalis Fr. 
cf. also Fomes albogrisens PK. 
(Fomes laricis). 
8. Surface of pileus grayish-brown, brown or reddish: (9) 
9. Growing on Ash; pileus ungulate, gray to blackish. 
Fomes fraxinophilus PK. 
9. Growing mostly on conifers; at least not on Ash: (10) 
10. Pileus ungulate, resinous, sulcate, G-l 0 cm. thick; margin often 
reddish to yellowish : Fomes pinicola Fr. 
(Fomes ungulatus). 
10. Pileus irregularly extended, applanate, light-brown, .5-2 cm. thick; 
usually growing from roots or near the ground : Fomes annosus Fr. 
11. Pileus applanate; surface white, gray or brown, concentrically sul- 
cate; very common everywhere on dead timber: pores when fresh 
turn brown to black w-hen bruised. • Fomes applanatus. 
(Elfvingia megaloma). 
11. Pileus ungulate: (12) 
12. Flesh punky, homogeneous (i. e. not zonate) ; mostly on Birch and 
Beach : Fomes fomentarius Fr. 
(Elfvingia fomentarius). 
