Video link: https://www.youtube.com/watch?v=EGlaQhDi5ts
Yesterday while walking past a landscaped area, a series of what looked initially like overturned acorn tops caught my eye. Upon closer investigation, it turned out to be a population of Bird's Nest Fungi!
Check out this high speed video of a water drop hitting Bird's Nest Fungi!
Bird's Nest Fungi make up the family of Nidulariaceae and are Basidiomycetes! Once recognized, it quickly becomes obvious why they are called "bird's nest fungi." Notice the small things within each "nest" that look like eggs! Those are called peridioles, and they are just little structures that contain spores.
When a rain drop falls in the cup, the peridioles get ejected and break down, releasing the spores into the environment! It's quite remarkable.