First pictures look like Chara and it typical growth habit, but later picture of the single plant stem looks different and not like Chara. This picture of the single stem is pretty blurry and from that blurry picture, it could be any of numerous plant species. Did the stem come from the roundish clumps in the first 2 pictures? Is the pond fairly new? Chara and Nitella are primary invaders in relatively new, bare bottom ponds.

Last edited by Bill Cody; 04/24/13 08:53 AM.
aka Pond Doctor & Dr. Perca Read Pond Boss Magazine -
America's Journal of Pond Management