NATURAL HISTORY SI'ltVKV 111 



With a simple central or eccentric stem I 



With numerous pileoli from a short fleshy stem or 



tubercle ."> 



With pileus sessile, dimidiate or effused-reflexed. . . 7 



1. Stem not black at the base ... 2 



1. Stem black at the base 1 



2. Pileus thick, spongy-corky P. r chtreinit:ii. 



2. Pileus thin, glabrous 3 



3. Stem glabrous, pores medium size, do- 

 current P. poripes. 



3. Stem somewhat scaly, pores huge, rhom- 



boidal P. arcularius. 



3. Stem villous-scaly, pores small, angular or 



circular P. brumal is. 



4. Pileus glabrous, pores small, plant epixylous . . P. picipes. 

 4. Pileus subtomentose, pores large, plant ter- 

 restrial P. radicatus. 



5. Pileoli broad, reddish-yellow, pores sul- 

 phur-yellow P. sulphuri us. 



5. Pileoli narrow, fuliginous, pores while 6 



6. Pores very small, acute P. frondosus. 



G. Pores large, unequal, angular P. Berkeleyi. 



7. Pileus reddish-ferruginous, brownish or 



fuliginous s 



7. Pileus pallid-fuliginous 9 



7. Pileus whitish, dimidiate 10 



7. Pileus irregular in shape 12 



8. Pileus reddish-yellow, pores tawny.. P. nidulans. 



8. Pileus reddish-brown, pores pallid P. resinosus. 



8. Pileus yellow-fuliginous, pores brown-fer- 

 ruginous • P. gilvus. 



9. Substance thick, pores not becoming 



black in drying P. fumosus. 



9. Substance thin, pores becoming black in 



drying . . . .P. ml us! us. 



10. Context zoned P. galactinus. 



10. Context not zoned 11 



11. Pileus thick, smooth, pores white P. chioneus. 



11. Pileus thin, fleshy-tough, pores brownish 



flesh-color P. dichrous. 



12. Pileus tuberculous, whitish, pores con- 



colorous P. distort us. 



Polyporus Schweinitzii Fr. 



Pileus date-brown, thick, spongy-corky, strigose-tomentose, 

 rugged. 



Stem very thick, short or obsolete, ferruginous. Context 

 brown, soft. 



Pores large, variable in size, torn, sulphur-greenish. Spores 

 oval, white or transparent, 8x3/*. (W. G. Smith.) 



