9 



Order I. HYMENOMYCETES 



Basidia and spores exposed in the mature plant (fig. 8). 



Families I-VI. 



IV. 



V. 



VI. 



Fig. 8. — Basidia and spores of Mushroom {Psalliota campestris Quel.). 

 b, basidia ; sp, spores ; c, cystidia or barren basidia ; 

 st, sterigmata ; h.c, hymenial cells. X 1000. 



I. Agaricace^e. Hymenium spread over the surface of radiating 

 gills or lamellae. Genera 1-58 



II. Polyporace^e. Hymenium lining the surface of small pores 

 or tubes. Genera 59-69 



III. Hydnace^e. Hymenium spread over spines or protuberances. 



Genera 70-79 



ThelephoracEjE. Hymenium unilateral, spread over a firm 

 smooth or corrugate under or upper face. Genera 80-90 



CLAVARiACEiE. Hymenium spread over the surface of smooth, 

 simple or branched clubs ; in Sparassis over a large sponge- 

 like mass of coalescing branches. Genera 91-96 



TrEMELLINACEjE. 



surface. 



Hymenium spread over a smooth gelatinous 



Genera 97-106 



