I'd say a very dreary, droopy looking Water Sprite.
My comp. is being wierd, I can't link you, but this is taken from Tropica's website:
Ceratopteris thalictroides
Family Pteridaceae
Continent Pan Tropic
Region Pan Tropic
Country of origin
Height 15-30 cm
Width 10-20 cm
Light requirements high-very high
Temperature 20-28 °C
Hardness tolerance very soft-very hard
pH tolerance 5-9
Growth very fast
Demands easy
This plant normally grows fast, but the addition of CO2 may be necessary to promote growth. In small open aquariums it can grow out of the aquarium and form beautiful surface leaves. The finely branched leaves are very decorative and provide good contrast to other leaf shapes. In good light Ceratopteris thalictroides grows fast and helps prevent algae by consuming large amounts of nutrients. This makes it a good starter plant in small aquariums.
I have this plant but find it to be a little picky.