ORDER I. HYMENOMYCETES 



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



Families I-VI. 



SP 



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. PoLYPORACEiE. Hymenium lining the surface of small pores 

 or tubes. Genera 59-69 



III. HYDNACE/E. Hymenium spread over spines or protuberances. 



Genera 70-79 



IV. THELEPHORACEyE. Hymenium unilateral, spread over a firm 



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



V. CLAVARIACE^K 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 



VI. TREMELLINACE^E. Hymenium spread over a smooth gelatinous 

 surface. Genera 97-106 



