202 FUNGUS-FLORA. 



thin membranaceous film that liere and there produces 

 clusters of large, irregular pores averaging about ^ mm. 

 across. 



Forming a thin, white, or slightly rufescent, bj^ssoid, 

 broadlj' efl'used, close membrane, here and there traversed by- 

 rooting ribs. (Fries.) 



Poria callosa. Fr. 



Broadly ell'used, white, equal, tough, separable like a 

 sheet of leather, flesh thick, firm, but not ligid, 1-2 lines 

 thick, everywhere covered with round, equal, quite entire 

 pores that form a firm stratum, spores obliquely elliptical, 

 6 X 3 • 5 /x,. 



Poll/poms callosus, Fries, Syst. Myc. i. p. 381 ; Stev., Brit 

 Fung., p. 217. 



On rotten Avood. Readily known by the thick, leather- 

 like flesh, and by separating readily from the substratum. 



Poria mucida. Fr. 



White, then ^lallid, rather thick, soft, subimmersed, margin 

 indeterminate, byssoid, pores medium-sized, unequal, torn, 

 seated on the flesh formed by the mj^celium. 



Polyporus miicidus, Fries, Sj'st. Myc. i. p. 382; Stev., 

 Brit. Fung., p. 217. 



On rotten fir wood. Forming patches .5-6 in. or more 

 long, I in. or more thick. Varies, softer or firmer according 

 to the position, but is moderately persistent, generally moist, 

 much thicker than P. mollusca. Tubes 1-3 mm. long, pores 

 l—)j mm. across. 



Poria hybrid a. V>. & Br. 



White, inyccliuin forming rather thick, felt-like patches 

 or branched, creeping strands ; pores long, minute, slender, 

 in scattered patelies, not forming a continuous hymenium ; 

 spores elliptic-oblong, colourless, 4 x 2 /t. 



Pohjporiis liijhridua, Berk. & Broome, in Berk., Outl., 

 p. xviii ; Stev., Fung., p. 221. 



On oak wood. Causing tlio dry-rot of oak ships. Sup- 

 posed by Fries to be a nun bid form of some species (perhaiis 

 P. destructor), its [)eculiarities caused by the abnormal con- 

 dition under which it occurs. Pores about } mm. diameter, 

 2—4 mm. long. 



