POLYPORUS. 205 



gin very obtuse, ferruginous. Pores very small, plane, confluent- Polyporus. 

 stratose, naked, ferruginous. 



The typical form with the pileus even, varnished, and shining-, presents a 

 most distinct species, but with this is confounded a trivial form with the pileus 

 triangular, rugose, opaque, which approaches P. igniarius. Rostk. t. 51. 

 Qtiel. t. 19. f. 3. 



On living and dead birch. Uncommon. May-Oct. 



5-15 cent. (2-6 in.) broad. Sometimes exactly the shape of a horse's hoof. 

 Name niger, black. Blackish. Fr. Hym. Eur. p. 558. Icon. t. 184. /. 2. 

 Berk. Out. p. 245. C. Hbk. n. 777. S. Mycol. Scot. n. 733. 



60. P. igniarius Fr. Pileus at first tuberculoso-globose (im- 

 marginate), even, with a thin,flocculose, adpressed, hoary covering, 

 then hoof-shaped, ferruginous then fuscous -blackish, opaque, 

 cuticle concrete, roughly uneven, very hard ; flesh zoned, ferrugi- 

 nous, very hard, margin rounded. Pores very small, convex, 

 stratose, cinnamon, when old stuffed with a white substance, at 

 the first hoary. 



It differs from preceding species in its entire nature and life-history. The 

 new growth, which is vernal, makes smaller specimens throughout, and larger 

 ones only at the margin and on the hymenium (which is also at first desti- 

 tute of pores) floccoso-hoary, then ferruginous, at length dark. tt varies 

 resupinate : Mich. t. 62. Unsuitable for tinder, but used for burning. 



On ash, poplar, willow, plane, cherry. Common. May-Nov. 



Pileus narrower and thicker than P. foment arius, resembling a horse's hoof. 

 Mass of tubes in general plane or very convex. A4.J.B. Name ignis, fire. 

 From its being used for burning. Fr. Hym. F.itr. p. 559. Berk. Out, p. 246. 

 C. Hbk. n. 778. S. Mycol. Scot. n. 734. Lenz f. 47. Ventiir. t. 6i./. 4. 

 Rostk. 4. t. 54. Linn. Bull. t. 454. Bolt. t. 80. Sow. t. 132. 



61. P. fulvus Fr. Pileus tawny, at length becoming hoary, 

 woody-corky, very hard, exactly triangular, even (not concentri- 

 cally sulcate), at first hairy or villous. Pores curt, round, minute, 

 cinnamon, at first covered with cinereous-yellow pruina. 



Pileus convex on both sides, adnate by a broad base, not very obtuse at the 

 margin. Pores not distinctly stratose. 



On decayed trunks. Rare. 



Name -fulvus, tawny. Fr. Hym. Eur. p. 559. Icon. t. 184. /. 3. B. 6* 

 Br. n. 1138. C. Hbk. n. 779. 



62. P. pectinatus Kl. Pileus ferruginous -fuscous, corky- 

 woody, hard, triangular, concentrically lamellato-plicate above, 

 tomentoso - scaly ; margin pale-yellowish^ naked. Pores very 

 small, curt, obtuse, pale-yellowish, naked. 



It is doubtful whether the margin and pores are always naked. 



