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RESEARCHES ON FUNGI 



B 



H 



FIG. 4. Psalliota campestris. The discharge of the third and fourth 

 spores from a basidium as seen in lateral view. A-D, stages 

 in the discharge of the third spore ; E-H, of the fourth. A, a 

 drop of water has just begun to be excreted at the hilum of the 

 right-hand spore. B, about two seconds later than A : the 

 drop has grown. C, about three seconds later than B : the 

 drop has attained its maximum size. D, a fraction of a second 

 later than C : the spore has been shot away and has carried 

 the drop with it. Between D and E there is a pause of several 

 minutes. E, F, and G show the growth of the water-drop at the 

 hilum of the fourth spore, whilst H shows the appearance of the 

 basidium after the fourth spore has been shot away. Magnifica- 

 tion, 1,320. 



