THE POLYPORACEAE OF WISCONSIN. 23 



Polyporaceae. 



Fleshy, leathery or woody fungi, the carpophore variously shaped 

 or wanting. Hymenophore typically porose and on the underside of 

 the pileus. Pores rounded or angular sometimes sinuous or lacerate. 



The following key to the genera is based on that of Fries. 



Key to the Genera. 



1. Fructification consisting of tubules only, the receptacle entirely wanting; 

 tubules gregarious on substratum, at first closed Solenia Hoffm. 



2 Pileus expanded, membranaceous; tubules at first papilliform, becoming 

 elongate Porothelium. 



3. Pileus effused, membranaceous, pores mere pits formed by reticulating 



folds Merulius Hall. 



4. Tubes in a gelatinous layer distinct from the pileus; dimidiate or effuso- 



reflexed Gleoporus Mont. 



5. Pileus semi-stipitate, pores alveolar, arranged in radiating series from the 



stipe Favolus Fries. 



6. Pileus dimidiate, coriaceous; pores sinuous, labyrinthine. Daedalea Pers. 



7. Pileus usually woody or corky; tubules unequally sunk into the substance 



of the pileus, round, or elongate, entire Trametes Fries. 



8. Pileus wholly resupinate; sometimes obsolete Poria Pers. 



9. Tubules at first punctiform, developed from the center outwardly; hy- 



menophore coriaceous, or membranaceous Polystictus Fries. 



10. Stratum of tubes distinct from hymenophore, but not separable; usually 



stratose, woody, sessile, dimidiate Fomes Fries. 



11. Stratum of tubes distinct from hymenophore, but not separable, not stra- 



tose; flesh, tough, stipitate or sessile Polyporus Michx. 



12. Stem lateral or wanting; tubes distinct from each other but crowded to- 



gether at first resembling warts Fistulina Bull. 



13. Tubules not easily separating from the pileus nor from each other, formed 



by numrous radiating broader lamellae everywhere connected by nar- 

 rower anastomosing plates Boletinus Kalchb. 



14. Tubules longer, with difficulty separating from the pileus; not radiate. 



Strobilomyces Berk. 



15. Tubules long, easily separable from the pileus and from each other. 



Boletus Dill. 



