PANAEOLUS CAMPANULATUS 291 



hymenium of Fig. 96 belong to five classes. In order to demonstrate 

 this point still more clearly, a small portion of the hymenium, 

 namely, the black area B, has been represented in Fig. 98 on a 

 larger scale and analysed in detail. This analysis of a piece of the 

 hymenium in cross -section corresponds to the analysis given in 

 Fig. 94 (p. 276) for a piece of the hymenium as seen in surface 

 view. 



In Fig. 98, at A, the elements represented are exactly similar 

 to those shown in Fig. 96 (p. 287) in the area B, except for the fact 

 that the subhymenium, 5, has been toned down, so that by 

 contrast the hymenium, h, stands out more clearly. At B, the 

 four basidia of the past generations present in A are shown by 

 themselves in their original relative positions. In a similar manner 

 are represented : at C the basidia of the present generation, at I) 

 the basidia of the coming generation, at E the basidia of future 

 generations, and at F the sterile paraphyses. No single hymenial 

 element shown at A has been omitted in this analysis, but every 

 one has been placed in one or other of the five classes represented 

 in B, C, D, E, and F. The letters A, B, C, D, E, and F in Fig. 98 

 correspond respectively to the letters A, B, C, D, E, and F in 

 Fig. 94 (p. 276). Just as the area B in Fig. 96 has been 

 analysed in Fig. 98, so might be analysed any of the other areas 

 of Fig. 96. There is no hymenial element represented in Fig. 96 

 which does not belong to one of the five typical classes ; and an 

 analysis of the hymenial elements of its areas B, C, F, and H, has 

 been partially carried out by means of the letters a, b, c, d, and e 

 which indicate past, present, coming, and future generations of 

 basidia and paraphyses respectively. 



So far we have dealt with a cross-section of a hymenium taken 

 when the process of spore-discharge has been going on for only 

 24 hours ; but the question may be asked : what is a cross-section 

 of the hymenium like when several days have passed by and spore- 

 discharge has ceased ? The answer is given in Fig. 99. Here 

 the trama, t, and the subhymenium, s, have been toned down so 

 that the hymenium, h, may be more easily distinguished. At w 

 are two waste spores which were not successfully discharged and 

 are therefore clinging to the hymenial surface. The hymenium is 



