CLASSIFICATION 



359 



of the spores, presence of cystidia, presence of latex and its change 

 of color on exposure, and change of color of basidiocarps on 

 being bruised and their taste are among the features that must be 



Plane 



Convex 



Infimdibuliform 



Umbilicate 



Reflexed 



Involute 



Campanulate 



Fig. 141. Characteristic shapes of pilei, in diagram, used in distinguishing 



genera of mushrooms. 



taken into account in distinguishing species. Experienced my- 

 cologists admit that species are separated on minor differences 

 and that among the larger genera the species are monotonously 

 similar. 



The bibliography on the taxonomy of Agaricaceae is very ex- 

 tensive, a fact which can be appreciated by consultation of the 

 references in North Avierican Flora, \^olume 9. Many of the 



