HYMENOMYCETES 351 



brittle, and are often broken away in old specimens, leav- 

 ing the hymenium bald and smooth. In Hymenochaete 



FIG. 1 02. Corticium scutellare. The sporophore is 

 adnate, or closely adherent to the matrix at every point, 

 and the upper, exposed surface is entirely covered by the 

 hymenium. Nat. size. 



the cystidia are brown in colour, thick-walled, and not at 

 all incrusted with lime. Next in the sequence of evolution 

 comes the genus Stereum ; the hymenium is still perfectly 



