POLYPORUS. 205 



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

 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. 

 Quel. 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. It 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. fomentarius, resembling a horse's hoof. 

 Mass of tubes in general plane or very convex. M.J.B. Name-f^w, fire. 

 From its being used for burning. Fr. Hym. Eur. p. 559. Berk. Out. p. 246. 

 C. Hbk. n. 778. S. Mycol. Scot. n. 734. Lenz f. 47. Ventur. t. 61./. 4. 

 Rostk. 4. t. s^—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. & 

 Br. 71. 1138. C. Hbk. 71. 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. 



