MICHIGAN ACADEMY OF SCIENCE. 
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53. Pileus large, 10-14 cm. wide, dark rusty-brown, with thick margin; 
flesh thick, shining; on oak: Polyporus dryophilus Berk. 
(Innotus dryophilus). 
53. Pileus smaller, 5-10 cm. wide, surface rusty-yellowish, darker in age, 
imbricate : 
form (A) applanate, thin margin: 
form (B) subtriangular to effuso-reflexed, but thick: 
n Poly porus gilvus Fr. 
(Hapalopilus gilvus). 
53. Surface of pileus hirsute (stiff-hairy), to tomentose: (54) 
53. Surface glabrous or nearly so : (55) 
54. Pileus large and thick, 3-5 cm. thick, spongy-corky, subungulate, sur- 
face hispid, yellow-furruginous then dark; tubes about 1 cm. long. 
On living trunks : Polyporus hispidus Fr. 
(Innotus hirsutus). 
54. Pileus thin, .5 to 1 cm. thick, spongy-fleshy, flabelliform (fan-shaped), 
surface tomentose, grayish to ferruginous; tubes 3-5 mm. long; on 
dead and living trunks : Polyporus perplexus Pk. 
(Innotus perplexus). 
55. Pileus large, 10-15 cm. broad, surface concentrically sulcate, fer- 
ruginous; margin whitish, on white oak: Polyporus loJxitus Schw. 
(Elfvingia lobata) . 
55. Pileus smaller, tawny, 3-9 cm. broad: (56) 
56. Pileus corky, rigid, radiate-rugose, margin thin; tubes glistening: 
Polyporus radiatus Fr. 
(Innotus radiatus). 
56. Pileus fleshy-pliant, not rugose, margin thick ; tubes hardly glisten- 
ing; on sticks and branches: Polyporus rutilans Fr. 
(Hapilopilus rutilans) . 
Polystictus. 
1. Pileus with a distinct central stem; mostly on the ground:. ... (2) 
1. Pileus without a distinct stem: (3) 
2. Pileus with a lacerated margin, shining cinnamon: 
Polystictus cinnamomeus F. F. Gray 
(Coltrichia cinnamomea) . 
2. Pileus with even or slightly hairy margin, rusty-brown : 
Polystictus pcrcnnis Fr. 
(Coltrichia perennis). 
3. Fruit-body at first cup-like and sterile, attached by a narrow ses- 
sile base, later developing the fertile pileus on one side, whitish, 
zonate, not effuso-reflexed : Polystictus conchifer Fchw. 
(Poronidulus conchifer) . 
Fruit-body without a differentiated earlier cup: (4) 
3 . 
