In this moss, we added water to the peristome. Then with the tip of a paper towel we removed the water and watched the magic happen. This specimen is under a dissecting scope, hence the funny circular view, and I used the video function on my digital camera to record it. I cannot recall the species name of this moss. I am pretty sure it is either in the genus Ulota or Orthotrichum, both in the Orthotrichaceae.
Thanks to Dr. Goffinet for bringing in this moss and helping to make this video.