POLYPOEEAE. 183 



Hymenophore inferior and pointing to the ground in the 

 higher forms, turned towards the light in resupinate forms, 

 normally porous ; pores rounded, angular or elongated and 

 sinuous, bearing on their inner surface the usually tetra- 

 sporous basidia, accompanied in some species by cystidia. 

 Spores continuous, colourless or coloured. 

 Polyporei, Fries, Hym. Eur., p. 495. 



ANALYSIS OF THE GENEEA. 



POLYPOREAE. 



Merulius. Subgelatinous. Tubes very shallow, formed by 

 anastomosing wrinkles ; resupinate. 



Daedalea. Tubes as in Trametes, but sinuous and laby- 

 rinthiform ; corky ; not stratose ; sessile. 



Trametes. Tubes immersed in flesh of pileus, of various 

 depths, hence not forming a heterogeneous stratum, 

 subcylindrical, not stratose ; corky ; sessile. 



Poria. Tubes as in Polyporus, not stratose ; entirely resu- 

 pinate. 



Polystictus. Tubes as in Polyporus, not stratose, generally 

 developing from the centre to the margin, at first 

 shallow and punctiform, coriaceous or membranaceous. 



Fomes. Tubes as in Polyporus, often stratose ; woody ; 

 sessile, dimidiate. 



Polyporus. Stratum of tubes distinct from hymenophore, 

 but not separable, not stratose; fleshy and tough, 

 stipitate or sessile. 



Fistulina. Fleshy, lateral, tubes crowded but distinct. 



Strobilomyces. Tubes like Boletus, but pileus with large 

 scales ; stem central. 



Boletus. Stratum of tubes easily separable from hymeno- 

 phore ; stem central. 



