Pond Boss Forums AQUATIC VEGETATION Identifying plants Pond Plant Mega-Mystery

I always hesitate to provide a definative name from just a photograph. I like to have the plant "in hand" to closely examine it properly. For this one the first place I would start looking is the genus Fissidens - leafy liverworts. HOwever the habitat may not be correct for liverworts.

The second place I would look is the aquatic mosses.
For starters see this:
http://www.aquamoss.net/Stringy-Moss/Stringy-Moss.htm