AGARICALES 



105 



2. Normally pileate, only accidentally resupinate. 3. 

 Normally resupinate. 6. 



3. Pores usually small or medium size, round or angular. 4. 

 Pores large, hexagonal or lamelliform. 7. 



4. Hymenium waxy, separating like a membrane from the context when 



wet. GLOEOPORUS. 



Hymenium not waxy ; not separable from the context. 5- 



5. Trama (i. e., the substance of the pileus) descending between the 



pores. * TRAMETES. 



Trama not descending ; substance between the pores different from that 



of the pileus. PoLYPORUS. f 



6. Pores parallel, seated on a membranous or more or less fleshy base. 



PORIA.J 



Pores in the summits of small papillae, fixed to a membranous base. 



POROTHELIUM. 



7. Stems lateral ; pores long hexagonal. FAVOLUS. 

 Sessile or resupinate ; pores regular hexagons. HEXAGONIA. 



8. Lamellae concentric : stem central or nearly so. CYCLOMYCES. 

 Lamellae radial ; sessile or accidentally resupinate. LENZITES. \ 

 Lamellae sinuous and labyrinthine ; normally sessile. DAEDALEA. 



Several of the above species have few representatives in our 

 flora. Glocoporus has only one, G. conchoides, which is compara- 

 tively common ; Favolus has one species everywhere common on 

 beech and hickory and two or three less common ; Cycloniyces 

 has a single extremely rare species ; Hexagonia has only one or 

 two species found only southward ; Porothelium has only one 

 species that is anywhere common. Lenzites and Daedalea have 

 each a dozen or more species of quite diverse habit, and Me- 



* This distinction is often very poorly defined in many species and shows 

 an artificial separation of genera. 



f Saccardo and others separate from this genus I. Fomes. woody 

 species with mostly stratose pores, and 2. Polystictm with leathery context, 

 leaving the more or less fleshy species in Polyporus. These distinctions at 

 best are artificial ; Karsten has distinguished several genera. 



\ Almost any species of Polyporus may become resupinate and this genus 

 doubtless contains several described species that are normally pileate. 



\ By many this genus has been placed among the Agaricaceae because 

 of its lamellae which only occasionally anastomose. Its habit places it here 

 and it really forms a connecting link between the two families. 



