Hmmmm,
I'll guess first and guess hornwort.
check this picture
http://www.grumpyspond.com/pics/hornwort.jpg
and see if it matches.

Subject: submerged plant identification
Hi all - I was recently given some parrots feather. Mixed in with it is
other plants which look very similar at the stem but the leaves are very
thin 3/4 - 1" needles growing all around the stem. No 'branches'.They are
not bunched together in any way. Just fine thin needles, not very dense,
growing all around the base stem. Similar to needles on a pine tree but
thinner. This is probably a common submerged plant. Can you tell me what it
is?
Thanxx
Bill Brister - Austin, Texas






kathy :-)
algae primer
http://hometown.aol.com/ka30p/myhomepage/garden.html