I received this plant with a few other species of aquatic Utricularia in a trade a few weeks ago, but didn't notice it until recently. I have a feeling I have seen this plant somewhere before, but I'm not sure what it is. It's not currently making bladders, but I'm guessing that is because my conditions are not ideal rather than because the shoots are dimorphic.
I'm going to go with striata unless anyone objects, assuming it is native to North America. It seems too small to be inflata, radiate, or macrorhiza and doesn't have the non-carnivorous shoots or affixed aquatics.
I had U. striata for a while and that looks almost the same, I would definitely go with that. It's a very easy grow.
That is comforting. The person I got it from couldn't get it to produce bladders and it kept getting smaller, though. It is encouraging to see it and the foliosa start making bladders again, although I have a feeling I will need to get a larger container soon.
If it is striata I was able to grow it in a centimeter of water in a 5 inch wide plant saucer, it completely overtook the plant saucer and grew extremely vigorously, that being said it might be fine in a small container and grow vigorously, but it could do good in a large container to.