HYMENOMYCETES 353 



substratum, whereas in the most perfect species there is 

 a truly central stem supporting a funnel-shaped pileus, 



FIG. 104. Stereum hirsutum, a fungus having a sporo- 

 phore which is partly adnate to, or lying flat and attached to. 

 the matrix, whereas the upper portion of the sporophore is 

 free from the matrix, and grows at right angles to it. The 

 hymenium or spore-bearing portion is on the under side of the 

 free portion ; the upper side is sterile and protective, i, fun- 

 gus growing on a piece of dead wood ; 2, section of same ; 

 3, basidia, each bearing four spores. Figs, i and 2, nat. size; 

 fig. 3, mag. 



bearing the hymenium on its under surface. In many 

 of the lateral-stemmed species of Stereum the pileus is 



z 



