228 FUNGUS-FLORA, 



radiating fibres often more or less zoned. Fores 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, angialar, or torn. 



Pohjporus, Mieheli, Gen., p. 129, emended by Fries, Nov. 

 Symk, p. 30; Ckc., Praec, Grev., p. 80, 188G. 



Distinguished from Polystidus by the thiolver flesh, which 

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

 pilous. 



The species of Folyporus with elongated sinuous pores are 

 distinguished from haedalea by the flesh being soft and 

 juicy at first, the slender narrow pores, thinner disse})iments, 

 and absence of a difierently coloured trama. Fonics diifers 

 from the present genus in the pileus being hard and woody 

 from the first, and in the stratose tubes. 



ANALYSIS OF TEE 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 bonic on a common simple or much- 

 branched stem or short, thick tubercle. 



IV. Arus. 



Pileus sessile, dimidiate or elTuso-rcflexed. 



* Pileus ferruginous, brownish, or dark fuliginous. 



** I'ileus white, pale ochraceous, yellowish, &c. 



