PANAEOLUS CAMPANULATUS 



281 



examinations proved, gradually enlarge during the exhaustion of 

 the hymenium and, by the end of the spore-discharge period, they 

 have attained their maximum size. This is made very evident by 

 a comparison of Fig. 94, F (p. 276), which shows the size of the 

 paraphyses in a hymenium which has not long been shedding spores, 

 and Fig. 95, B, which shows the size of the paraphyses in an 

 exhausted hymenium. When the paraphyses have attained their 



A B 



FIG. 95. Panaeolus campanulatus. Analysis of the ex- 

 hausted hymenium from a fruit -body which has 

 ceased to shed spores. A, the basidia (all belonging 

 to past generations) can be recognised by their sterig- 

 matic stumps : they slightly overlie the paraphyses. 

 One waste spore lies on the hymenium. B, the para- 

 physes of A sketched by themselves. Magnification, 

 580. 



full development, the layer of protoplasm upon their walls is very 

 thin, and the major part of their contents consists of a large vacuole. 

 In this condition, therefore, they are very transparent. Sometimes, 

 in parts of an exhausted hymenium, aborted basidia are to be 

 found. These can be distinguished from the paraphyses by their 

 shape, which is more or less like that of a club, and by their proto- 

 plasmic content. The latter, although containing a large vacuole 

 in its centre, still forms a thick layer round the wall, and it has a 

 peculiar dense, granular consistence totally different from that of 

 the thin lining layer in the paraphyses. 



