Just aerial roots, nothing unusual about it. It is just looking for something to grab on to. You can give it a stick to climb if you want.

The common name is Pothos but it's real name is Epipremnum aureum.

Growing it in water is fine too. Just remember to fertilize it once it a while.

This post was edited by dellis326 on Wed, Jul 2, 14 at 18:37

Thank you so much! I was worried I was killing it.

Plants tend to grow aerial roots in humid conditions. I imagine Washington gets pretty humid. :)

If you wanted to, you could try cutting off an end of the vine with aerial roots and try growing it in soil, or adding it to the water to make another vine.