POLYPOEEAE. 183 



Hymenophore inferior and pointing to the grouncl in the 

 higher forms, turned towards the light in resiipinate forms, 

 normally porous ; pores rounded, angular or elongated and 

 sinuous, hearing on their inner surface the usually tetra- 

 sporous hasidia, accompanied in some species by cystidia. 

 Spores continuous, colourless or coloured. 

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



ANALYSIS OF TEE GENEBA. 



POLTPOEEAE. 



Merulius. — Suhgelatinous. 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 ia Polyporus, not stratose, generally 

 developing from the centre to the margin, at first 

 shallow and punctiform, coriaceous or membranaceous. 



Pomes. — 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. — rieshy, lateral, tubes crowded but distinct. 



Strobilomyces. — Tubes like Boletus, but pileus with large 

 scales ; stem central. 



Boletns. — Stratum of tubes easily separable from hymeno- 

 phore ; stem central. 



