NATURAL HISTORY SURVEY 111 



With a simple central or eccentric stem . . 1 



With numerous pileoli from a short fleshy stem or 



tubercle 5 



With pileus sessile, dimidiate or effused-reflexed 7 



1. Stem not black at the base 2 



1. Stem black at the base 4 



2. Pileus thick, spongy-corky P. chweinitzii. 



2. Pileus thin, glabrous 3 



3. Stem glabrous, pores medium size, de- 

 current P. poripes. 



3. Stem somewhat scaly, pores large, rhom- 



boidal P. arcularius. 



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



circular P. brumalis. 



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. sulphureus. 



5. Pileoli narrow, fuliginous, pores white 6 



6. Pores very small, acute P. frondosus. 



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



7. Pileus reddish-ferruginous, brownish or 



fuliginous 8 



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. adustus. 



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. distortus. 



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, 8 x 3 /x. (W. G. Smith.) 



