To Rev. Bresadola I am indebted for his determinations and opinions of a 

 number of doubtful specimens, and to Miss E. M. Wakefield, at Kew, for the sketches 

 that are used, as well as for various other helps in this work. 



DIVISIONS OF THE GENUS FOMES. 

 We have divided the species into seven general divisions and sections as follows: 



1st General Division, Pallidus. Context and pores pale, white, isabelline or pale 

 yellowish, pale rose or cinnamon. Spores hyaline. 



Section 55. Large. Context white, soft, friable p. 213. 



56. Large. Context white, hard p. 214. 



" 57. Small. Context white or isabelline p. 218. 



58. Context pale yellow p. 219. 



59. Context color isabelline. Context hard p. 220. 



' ' 60. Context isabelline. Soft, punky p. 220. 



61. Context pinkish cinnamon p. 220. 



62. Context cinnamon p. 223. 



63. Context pink or rose color p. 223. 



2cl General Division, Depallens. (As this section.) 



Section 64. Pores darker than the context, usually fading 



out in old specimens p. 228. 



3d General Division, Aurantiacus. Context orange rufous. 



Section 65. Spores hyaline (or very pale colored) p. 231. 



66. Spores colored. . . . , p. 232. 



4th General Division, Bicoloris. (As this section.) 



Section 67. Section with bicolored tissue, the pores a dark 



brown, the flesh a light buff. p. 232. 



5th General Division, Funalis. (As this section.) 



Section 68. Pilcus with a thick pad of dense, brown hairs, 

 analagous to section Funalis in Poly- 

 stictus p. 233. 



6th General Division, Fuscus. Context some shade of brown. Spores not truncate. 

 Section 69. Setae, none. Spores hyaline p. 234. 



70. , Setae present. Spores hyaline p. 241. 



71. Setae, none. Spores colored p. 248. 



' ' 72. Setae present. Spores colored p. 257. 



7th General Division, Ganodermus. Context brown. Spores truncate. 



Section 73. Fomes-Ganodcrmus. Pores with thin walls, p. 263. 

 ' ' 74. Ponderosus-Fomes-Ganodermus. Pores with 



thick walls p. 269. 



75. Stipitate Fomes of the Section Ganodermus. . p. 270. 



FIRST GENERAL DIVISION PALLIDUS. 



Context and pores pale, white, isabelline or pale yellowish, pale rose or cin- 

 namon. Spores hyaline. 



SECTION 55. LARGE. CONTEXT WHITE, SOFT, FRIABLE. 



FOMES LARICIS. Pileus ungulate, when young with a thin, 

 smooth crust, which soon becomes broken up into a rough surface. 

 Flesh white, soft, friable, bitter to the taste. Pores minute, white 

 with yellowish mouths. Spores (W.) 2^>x4, elliptical, hyaline, apic- 

 ulate, guttulate. 



213 



