Powdered Sugar

The amount of pollen produced by clasping pondweed species in August is quite amazing, like a dusting of confectioner's sugar. I recall seeing bits of white floating on the water's surface everywhere we went on one of the survey days up north. The white mass splits apart and floats off in much smaller blobs. 

We had a specimen in a water tray overnight, and were treated to this amazing sight the next day, showing how prolific a pollen producer it is.