210 FUNGUS-FLORA. 



Poria contigua. Pr. 



Effused, about ^ in. thick, firm, when young cinnamon, 

 dingy when old ; pores rather large, equal, entire ; margin 

 at first villose, 



Polyporus contiguus, Fries, Hym. Syst. Myc. i. p. 378 ; 

 Stev., Brit. Fung., p. 212. 



On rotten wood, fallen branches, &c. Not so broadly 

 effused as P. ferruginea, from which it is also known by the 

 absence of a rust-coloured tinge. There is often a yellowish- 

 orange tinge about growing specimens ; when dry often 

 obscure brown ; pores about ^ mm. across. 



Doubtful species. 



Poria bathypora. Eostk. 



Effused, white, margin thin, byssoid ; pores rather large, 

 cup-shaped, margin of dissepiments toothed. 



Polyporus haihyporus, Eostk. in Sturm's Deutschl. Or. EL, 

 p. 4, t. 59 ; Stev., Brit. Eung., p. 220. 



On dead wood. In the British specimen referred by 

 Berkeley to the above species, the pores are shallow and 

 varying from ^— | mm. across. 



POLYSTIOTUS. Er. 



Pileus coriaceous, membranaceous, or rather spongy, ino- 

 dermeous, i.e. cuticle thin and loosely fibrous. Tubes first 

 appearing in the centre and successively developing towards 

 the margin ; at first superficial and distinct, then becoming 

 deeper and more crowded, not stratose. 



Polystictus, Eries, Nov. Symb., p. 54 ; Cke., Prae. Poly., 

 Grev., p. 77, 1886. 



Polyporus, of most authors. 



Separated from the genus Polyporus in the old sense, by 

 certain peculiarities of structure ; the species are thin, 

 usually flaccid, never hard and woody, mesopod, dimidiate, 

 and imbricated, or effuso-reflexed and almost resupinate, 

 pileus velvety or strigose, pores shallow, never stratose, 

 towards the margin often sterile or with imperfect pores. 



In Polyporus, as understood in the present work, and 

 Fomes, the tubes are fully formed from the first, i.e., not at 



