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Cincinnati Society of Natural History. 



inches in breadth, and about I inch thick at the base. This species 

 seldom makes but the growth of a single year; when more than 

 one year's growth is made, a new stratum of hymenophore is inter- 

 posed between the successive strata of tubules as in P. vegetus, Fr. 



41. P. applanatus, Pers. Pileus horizontal, explanate, obsoletely 

 zonate, pulverulent or glabrous, cinnamon then canescent ; the 

 cuticle crustaceous, rigid, at length fragile ; within very soft, 

 loosely floccose ; the margin tumid, white then cinnamon. Pores 

 minute, subferruginous ; the mouth whitish, changing to brownish 

 when rubbed. 



On old stumps and logs ; very common. Pileus from 4 or 5 

 inches to 1 foot in diameter, and 1 to 2 inches in thickness, flattened 

 out and not at all ungulate, as in the next species. The pores are 

 distinctly stratified, and it often occurs with a growth of several 

 years. 



42. P. fomentarias \ Linn. Pileus ungulate-pulvinate, thick, 

 glabrous, remotely concentrically sulcate, opaque, sooty, then can- 

 escent; within soft, floccose, ferruginous-tawny; cuticle thick, very 

 hard, persistent; the margin glaucous-pruinose. Pores very long, 

 minute, distinctly stratified, at first glaucous-pruinose, afterward 

 ferruginous. 



This species is common in the Eastern States on trunks of beech 

 and birch ; in this region it must be extremely rare, as I never met 

 with a specimen, though it is in Lea's Catalogue. Pileus 3 — 5 

 inches in width, and 2 — 3 inches high, in shape much like a horse's 

 hoof. The cuticle is very hard, brownish gray, with cinerous and 

 dark zones ; the margin generally rather acute, and the surface of 

 the pores concave ; the substance within spongy, tawny, yielding 

 the best of amadou. The pores are distinctly stratified and at first 

 are whitish, glaucous or yellowish-gray, at length ferruginous. It 

 differs decidedly in form from the preceding species, with which it 

 was once included. 



43. P. rimosus, Berk. Pileus pulvinate-ungulate, much dilated, 

 deeply concentrically sulcate, cinnamon, then brown or blackish 

 and exceedingly rimose ; context very hard, fibrous-radiating, 

 tawny-ferruginous ; the margin broad, pruinate-velvety, rather 



