THE PILOBOLUS GUN AND ITS PROJECTILE 85 



as the acid made the re- 

 maining part of the wall 

 more and more translucent, 

 the tuck of the wall under 

 the edge of the convex 

 sporangium became clearly 

 revealed. 



The depressions or dim- 

 ples formed in the upper 

 black portion of the sporan- 

 gial wall as the sporangium 

 dries up vary in number 

 with the size of the sporan- 

 gium and in pattern with 

 the species. As a rule, the 

 larger the sporangium, the 

 more numerous are the de- 

 pressions. The difference 

 between the pattern of the 

 depressions on the sporangia 

 of P. Kleinii and that on 

 the sporangia of P. longipes 

 can be readily reaUsed by 

 comparing Fig. 39 with 

 Fig. 40 : the depressions of 

 P. Kleinii are rounded, 

 those of P. longipes irregu- 

 lar and somewhat gyrose. 



As a fruit-body from 

 which the sporangium has 

 been stroked off (Fig. 31, 

 p. 75) loses its turgidity, the 

 wall of the subsporangial 

 swelling just beneath the 

 columella contracts and 

 becomes very thick, whereas 

 the wall of the columella 



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