PANAEOLUS CAMPANULATUS 293 



represented as being fully exhausted. Its elements are of two 

 kinds only : exhausted basidia, 6, and more or less globular para- 

 physes, p. The exhausted basidia can everywhere be distinguished 

 by their shrunken bodies and flat ends. The paraphyses are every- 

 where rounded or oval in shape and appear to be fully turgid. 

 By comparison with Fig. 98, A (p. 292), which represents the 

 hymenium in an early stage of spore-discharge, it will be seen that 

 the paraphyses are now much larger than they were. It is evi- 

 dent that, as more and more basidia shed their spores and collapse, 



FIG. 99. Panaeolus campanulatus. Cross-section through the hymenium, h, 

 after spore -discharge has been completed. There are only two kinds of elements 

 present : collapsed basidia, 6, and swollen paraphyses, p. The tops of the 

 basidia overlie the now rounded paraphyses. Two spores, w, which were not 

 discharged, are shown lying on the hymenium. , the subhymenium ; t, the 

 trama. The subhymenium and trama have been softened so as to make 

 the hymenium more distinct. Magnification, 718. 



the paraphyses gradually increase in size. This expansion on the 

 part of the paraphyses makes up to a very considerable extent 

 for the lateral shrinkage of the basidium-bodies. Owing to this 

 compensation, the hymenium remains as a continuous membrane, 

 even when it has become completely exhausted. Fig. 99, which 

 shows the exhausted hymenium in cross-section, corresponds to 

 Fig. 95, A (p. 281), which shows the exhausted hymenium in 

 surface view. 



Up to the present we have studied the hymenium in two of its 

 stages of development only : ( 1 ) during the time that it is actively 

 discharging its spores, and (2) after it has ceased to shed spores 

 and has become completely exhausted. In order to complete our 

 analysis, it is necessary for us to consider the state of the 



