350 



PHYSIOLOGY OF THE FUNGI 



Fig. 73. Stills from ultra-high-speed film showing impact of drop of water with a fruit 

 body of Lycoperdon perlatum and the subsequent puff of spores. The drop, 5.0 mm. in 

 diameter, fell with a velocity of -440 cm. per sec. The time elapsed between the con- 

 tact of drop with peridiimi until the last photograph was 0.046 sec. (Courtesy of 

 Gregory, Trans. Brit. Mycol. Soc. 32 : 14, 1949. Published by permission of Cam- 

 bridge University Press.) 



