GENERAL SUMMARY 465 



only known hymenomycetous species in which the basidia are regularly 

 tristerigmatic and trisporous. 



Panaeolus campanulatus lacks pleurocystidia, but possesses a fringe 

 of cheilocystidia along the free edge of each gill. The cheilocystidia 

 excrete mucilaginous globules. 



Chapter XI. Stropharia semiglobata belongs to the Panaeolus 

 Sub-type, and its organisation for the production and liberation of spores 

 very closely resembles that of Panaeolus campanulatus. The author 

 describes the hymenium in detail and illustrates it with drawings 

 showing surface-views and cross-sections. The hymenial elements all 

 belong to one of six classes : (1) past-generations basidia, (2) present- 

 generation basidia, (3) coming-generation basidia, (4) future-generations 

 basidia, (5) paraphyses, and (6) cystidia. The efficiency of a given area 

 of the hymenium was determined by observing the total number of 

 spores which the area produced and the percentage of the spores which 

 failed to be properly discharged. 



Chapter XII. Anellaria separata belongs to the Panaeolus Sub- 

 type, and its organisation for the production and liberation of spores 

 resembles that of Panaeolus campanulatus and Stropharia semiglobata. 

 The author describes the fungus and, among other illustrations, shows 

 a photomicrograph of the spores belonging to the present spore-bearing 

 generation of basidia situated in one of the dark areas of the mottled 

 hymenium. This is the first photograph of the kind ever published. 



Chapter XIII. The author gives a full description of the general 

 characters of the Psalliota campestris fruit-body, including the mottling 

 of the gills, and points out that the gills are not truly deliquescent during 

 the spore-fall period. Dead fruit-bodies, enclosed in crystallising dishes, 

 give off ammonia gas during putrefaction. 



The occurrence of Psalliota campestris in fairy rings affords evidence 

 that new substrata below the turf are not easily invaded by mycelium 

 produced from spores. 



The author discusses the principles involved in the construction of 

 the stipe and of the pileus-flesh in relation to their function, the radial 

 arrangement of the gills, the depth and thickness of the gills, the presence 

 of the gill-chamber, the conditions of origin of the fruit-bodies, the 

 fate of fruit-body rudiments, and the effect of dry weather on fruit- 

 body development. 



Psalliota campestris possesses finely mottled gills and belongs to 

 the Panaeolus Sub-type. The organisation of its hymenium for the 

 production and liberation of spores closely resembles that of Panaeolus 

 campanulatus and Stropharia semiglobata. For the first time, the author 

 describes the structure of the hymenium in detail and illustrates it with 

 drawings showing both cross-sections and surface- views. For the study 

 of the hymenium, Psalliota campestris affords much less favour- 

 able material than Panaeolus campanulatus or Stropharia semiglobata, 



