THE PILOBOLUS GUN AND ITS PROJECTILE 79 



than in Figs. 33 and 34 ; No. 3, the peripheral paler part of the cap- 

 like portion of the sporangium-wall, now flattened, more or less 

 radially spht and in part fragmented ; No. 4, the black tuck of the 



Fig. 35. — Pilobolus longipes.. Photomicrograph ut Lh« under 

 side of a discharged sporangium and of the drop of cell- 

 sap (now dried) which accompanied it, taken through 

 a cover-glass to which the sporangium was attached. 

 No. 1, dried cell-sap containing long branched crystals ; 

 No. 2, a broad ring-layer of jelly attached to the glass 

 and covering a few isolated spores. No. 7, which were 

 forced out of the sporangium when this struck the glass ; 

 No. 3, the flattened peripheral part of the sporangivmi- 

 wall, seen through the jelly, a piece of which, No. 8, broke 

 away as the sporangium hit the glass ; No. 4, the black 

 flattened tuck of the sporangium-wall obscuring spores 

 from view (c/. Fig. 41, gr) ; No. 5, the main mass of the 

 spores, seen through the inner zone of the ring of jelly ; 

 No. 6, the columella flattened down on to the glass, its 

 peripheral band No. 9 (part of the sporangium-wall) 

 now forming a pentagon. Magnification, 51. 



sporangium-wall (c/. Fig. 41, g, p. 85), seen through the inner zone 

 of the gelatinous ring ; No. 5, thousands of spores massed together ; 

 No. 6, the columella pressed down on to the glass, with its periphery 

 now pentagonal in form ; No. 7, a few spores which, owing to the 

 violence with which the projectile impinged on the cover-glass, 

 were pressed out of the sporangium so that they lie between the 



