THE SPHAEROBOLUS GUN 



301 



layer, and (4) a receptaculum (the palisade or collenchyma layer) 

 made up of prismatic cells. Fischer regarded the first three layers 



>4: 





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3 



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Fig. 150. — Sphaerobolus stellatus. The basal part of the peridium 

 of a nearly mature sporocarp, highly magnified, consisting 

 of six layers : no. 1, mycelial hyphae ; no. 2, a gelatinous 

 layer ; no. 3, a pseudoparenchymatous layer ; no. 4, a layer 

 of interwoven largely tangential hyphae ; no. 5, the palisade 

 layer, here typically developed ; and no. 6, a thin layer of 

 pseudoparenchyma surrounding the gleba, g. Section 

 prepared and photographed by Leva B. Walker. Magnifi- 

 cation, about 350. 



as parts of the peridium and the receptaculum as being derived from 

 the gleba ; but Miss Walker and I are inclined to regard all the four 

 layers, including the receptaculum, as peridial. 



Miss Walker, 1 with the help of the microtome and modern 



1 L. B. Walker, loc. cit. 



