HYMENOMYCETES 345 



time since the differentiation of the fungi as a group, to 

 the appearance of perennial forms. 



There are no obvious departures from the type ideas of 

 structure presented by the Polyporeae, that suggest the 

 evolution of another sub-family. 



In the genus Nyctalis chlamydospores are formed on the 

 surface of the pileus. Conidia are formed in certain 

 species of Polyporus and Fistulina, and oidia are known in 

 some agarics. 



KEY TO THE FAMILIES 



Sporophore gelatinous ; basidia with two long, stout 

 sterigmata. Dacryomyceteae, 



Sporophore erect, club-shaped or much branched, every- 

 where covered by the hymenium. Clavarieae. 



Sporophore resupinate, dimidiate or with a central stem; 

 hymenium even, confined to one side of the Sporophore. 



Thelephoreae. 



Sporophore resupinate, dimidiate or with a central stem ; 

 hymenium borne on spine-like processes. Hydneae. 



Sporophore resupinate, dimidiate or with a central stem; 

 hymenium borne on flat plates or gills. Agaricineae. 



Sporophore resupinate, dimidiate or with a central stem ; 

 hymenium on the inner surface of tubes or shallow 



depressions. Polyporeae. 



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Dacryomyceteae 



Gelatinous when moist, horny when dry. Always small, 

 appearing as small spots of orange or dingy yellow jelly on 



