PANAEOLUS CAMPANULATUS 



297 



and we have been able to divide the basidia into those of past, 

 present, coming, and future generations. Surface-view and cross- 

 sectional illustrations have been given which are in harmony with 

 one another, and which clearly indicate the relations of the 

 hymenial elements in space and time. For the first time, the 

 hymenium of a Non-Coprinus Agaric has been analysed in detail. 



FIG. 101. Panaeolus campanulatus. Above, a section through the very young 

 hymenium, h, just prior to the development of spores by the first -generation 

 basidia, and through the subhymenium, s. a a, basidia of the first genera- 

 tion ; b 6, basidia of the 1 second generation ; c c, basidia of subsequent 

 generations ; p, paraphyses. Below, a similar section but here the sub- 

 hymenium has been softened so as to make the hymenium more distinct, 

 and the paraphyses have been left unshaded so that their size, number, 

 and arrangement relatively to the basidia become obvious at a glance. 

 Magnification, 718. 



The author feels that this marks a distinct stage in the advance 

 of our knowledge of the wonderful way in which the fruit-bodies 

 of the Hymenomycetes are organised for carrying out their one 

 great function of producing and h' berating spores. 



Significance of the Development of the Basidia in Successive 

 Generations on any One Hymenial Area, and of the Existence of 

 Various Areas. Now that we are acquainted with the arrange- 

 ment of the elements in the hymenium in space and time, we are 

 in a position to discuss the theoretical significance of the develop- 

 ment of basidia in successive generations on any one hymenial 



