"puffball" fungi

[Steven Carpenter]

Like most things in life, there isn't a single answer.  Both raindrops
and wind would work.  But be a good observer and watch a small lycoperdon
in the rain - I have, and for this genus, rain seems to be an excellent
medium for kinetic energy transfer to the sporocarp.  I am sure wind also
works, I have no doubt.

-Steven E. Carpenter, Ph.D.
 Cascade Research Associates
  & Abbey Lane Laboratory
 microbe at peak.org