NORTHERN POLYPORES 



Context not duplex as above. 



Pileus fleshy-tough to woody and rigid. 

 Hymenium more or less smoke-colored 



at maturity. 7. BJERKANDERA. 



Hymenium white or pallid. 



Context fleshy to fleshy-tough, fri- 

 able when dry. 5. TYROMYCES. 

 Context punky to corky, not friable 



when dry. 8. TRAMETES. 



Pileus thin, leathery, and more or less 



flexible, surface usually zonate. 

 Hymenophore preceded by a cup- 

 shaped sterile body. 2. PORONIDULUS. 

 Hymenophore not as above. 



Hymenophore normally pileate; 

 tubes small and nearly always 

 regular. 3. CORIOLUS. 



Hymenophore semiresupinate; 

 tubes large and irregular. 4. CORIOLELLUS. 



Hymenophore stipitate. 



Stipe compound. 15. GRIFOLA. 



Stipe simple. 



Plants fleshy, terrestrial. 14. SCUTIGER. 



Plants tough, epixylous. 



Tubes large, hexagonal and radially elongate 



from the first. n. HEXAGONA. 



Tubes not as above; except in Polyporus 



caudicinus. 



Pileus inverted, erumpent from lenticels. 10. PORODISCULUS. 

 Pileus erect or lateral, not erumpent. 



Context duplex, spongy above, woody 



below. 13. ABORTIPORUS. 



Context homogeneous, firm. 12. POLYPORUS. 



Context bright-colored, yellow or red; hymenophore sessile. 

 Pores red or reddish. 



Tubes unchanged on drying. 



Tubes fragile; surface anoderm. 16. PYCNOPORELLU& 



Tubes firm and regular; surface pelliculose. 17. PYCNOPORUS. 



Tubes orange-colored, becoming dark and resinous 



on drying. 18. AURANTIPORUS. 



Pores yellow; plants very large. 19. LAETIPORUS. 



Context brown. 



Hymenophore sessile. 

 Spores hyaline. 



Context light-brown. 



Context at first fleshy, becoming slightly 



corky. 24. ISCHNODERMA. 



Context tough from the first. 



Surface encrusted. 25. ANTRODIA. 



