Lentic life

I noticed some small, green, mossy-looking balls floating in the lake on my first paddle of the season (4/21/2025), so brought them home to look at more closely. They looked pretty nondescript and I assumed they were either seeds that had dropped into the lake from an overhanging shrub, or algae of some sort. I decided I would have to investigate further, so sliced through one of them to reveal this, which wasn't definitively helpful, but it seemed to support the idea of seeds or budding: I decided to try Google Lens for some suggestions, and was first led to Marimo (spherical moss balls) which didn't seem right, so I delved further down the suggestions and was heartened to find a reference to a bladderwort, written in Czech, which I got Google to translate for me. The species they referenced doesn't occur here, but it was mentioned as being close to our Northern bladderwort,  Utricularia intermedia,  which also produces a neat little winter bud (turion). So, it was probabl...