384 BRITISH FUNGI 



P. callosa. — Patches broadly effused, tough, separable as a sheet, 

 flesh 1-2 lines thick ; pores round, equal, edge entire. 



Readily known by the leathery flesh readily separating from 

 the wood. 



P. mucida. — White, rather thick, soft, edge indeterminate, 

 downy ; pores medium-sized, unequal, torn. 



Forming patches up to 6 in. across, and up to | in. thick. Tubes 

 about I line long. 



On rotten fir wood, 



P. hyhrida. — Forming thickish, felt-like patches or branched, 

 creeping strands ; pores minute, about ii-2 lines long, occurring 

 in scattered patches. 



Causing the dry-rot of oak ships. 



On oak wood. 



P. collahefacta. — Forming white, very smooth, Corticum-\\kQ 

 patches ; pores appearing as if due to the contraction of the hy- 

 menium into very shallow depressions. 



On dead wood, 



P. radula. — Patches formed entirely of loosely interwoven 

 mycelium, supporting medium-sized, shallow, angular pores with 

 toothed edges. 



With the habit of P. sangninolenta, but much looser and dryer 

 in texture, also separable from the matrix, and not turning red 

 when bruised ; pores sometimes oblique, usually bounded l3y a 

 sterile margin. 



On wood, dry branches, etc. 



P. obdiicens. — White, effused, encrusting, innate, inseparable 

 from the matrix ; pores minute, short, flesh almost obsolete, dis- 

 tinctly stratose, stratified portion pale buff. 



During the first year somewhat resembling P. vulgaris, after- 

 wards becoming stratose, a single stratum of pores about i line 

 thick being formed annually on the surface of the layer of the 

 previous season. Sometimes small pileoli are formed. It has been 

 definitely proved that this is only a resupinate condition of Poly- 

 forus connatus, yet it is given here also, as under certain forms it 

 appears to be such a typical Porta, that it might not be connected 

 with P. connatus. 



P. hymenocystis. — Snow-white, edge of patches cobweb-like >' 

 pores shallow, large, at length collapsing and tinged buff. 



Exceedingly thin, walls of pores soon collapsing. 



On dead wood, 



** White, changing colour when dry. 



P. subfitsco-flavida.—'Pa.tches, 6-10 in, across, thin, dry, changing 

 from white to yellowish brown, edge determinate, downy, white ; 

 pores minute, irregular. 



