POR1A. 203 



Poria collabefacta. B. & Br. 



Forming white, very smooth, Corticium-like patches ; the 

 formation of the pores appears to be due to the collapsing of 

 the substance, short; margin obtuse; spores colourless, 

 elliptic-oblong, 4 x 1 ' 5 p.. 



Polyporus collabefactm, B. & Br., Ann. Nat. Hist., n. 1432 ; 

 Stev., Fung., p. 218. 



On dead wood. The barren parts resemble exactly a very 

 smooth Corticium after the fashion of C. calceum ; the pores 

 seem first to arise from the mere collapsing of the substance, 

 always shallow ; margin obtuse. (B. & Br.) 



Size of depressions or pores very variable, ^-f mm. across. 

 Much more like an abnormal Corticium than a Poria. 



Poria radula. Fr. 



Effused, thin, white, formed entirely from the loose, dry 

 mycelium, villous below ; pores medium-sized, angular, 

 dissepiments toothed, pubescent when young. 



Polyporus radula, Fries, Hym. Eur., p. 578; Stev., Brit. 

 Fung., p. 219. 



On wood, dry branches, &c. With the habit of P. sanguino- 

 lenta, but much looser and drier in texture, also separable 

 from the matrix and not turning red when bruised. Pores 

 about ^ mm. across, sometimes oblique, usually bounded by 

 a sterile margin. 



Poria obducens. Pers. 



White, effused, incrusting, innate, inseparable, pores, 

 minute, short, flesh almost obsolete, distinctly stratose, 

 stratified portion pale buff; spores elliptical 4 x 2 /i. 



Polyporus obducens, Persoon, Myc. Eur., ii. p. 104 ; Stev., 

 Brit. Fung., p. 217. 



On rotten wood. During the first year somewhat re- 

 sembling P. vulgaris, afterwards becoming stratose, a single 

 stratum of pores about 1 line thick being formed annually 

 on the surface of the layer of the previous season. Some- 

 times small pileoli are formed, and in all probability the 

 present is only a resupinate condition of Forties connatus. 



Poria hymenocystis. B. & Br. 



Snow-white, mycelium below and at the margin cobweb- 

 like ; pores shallow, large, at length pallid, the very thin 



