Just recently noticed this growing in my small impoundment where I've been holding the water (fresh) since late spring. It's in clumps all through out in the middle areas and scattered along the edges. Long, thin and sort of rounded stem. No leaves. I had earlier this spring brought in wigeon grass and pond sago in hopes of it taking but it doesn't look that-unless this is an early growth stage. I've tried looking it up on the net but can't seem to ID it so any help would be appreciated.