228 FUNGUS-FLORA. 



radiating fibres often more or less zoned. Pores never stra- 

 tose. Sporophore descending into the hymenophore and 

 forming the trama (or dissepiments), hence the tubes (hyme- 

 nophore) are not separable from the sporophore; pores at 

 first obsolete or none, then rounded, angular, or torn. 



Polyporus, Micheli, Gen., p. 129, emended by Fries, Nov. 

 Symb., p. 30 ; Cke., Praec., Grev., p. 80, 1886. 



Distinguished from Polystictus by the thicker flesh, which 

 is soft and moist at first, also by the absence of zones on the 

 pileus. 



The species of Polyporus with elongated sinuous pores are 

 distinguished from Daedalea by the flesh being soft and 

 juicy at first, the slender narrow pores, thinner dissepiments, 

 and absence of a differently coloured trama. Fomes differs 

 from the present genus in the pileus being hard and woody 

 from the first, and in the stratose tubes. 



ANALYSIS OF THE SPECIES. 



I. MESOPUS. 

 Stem simple, central or excentric, not black at the base. 



II. PLEUROPUS. 



Stem simple, excentric or lateral, base black. 



III. MERISMA. 



Numerous pileoli borne on a common simple or much- 

 branched stem or short, thick tubercle. 



IV. APUS. 



Pileus sessile, dimidiate or effuso-reflexed. 



* Pileus ferruginous, brownish, or dark fuliginous. 



** Pileus white, pale ochraceous, yellowish, &c. 



