my water sprite started off looking like that untill i upgraded my lights. if you have under 2 WPG then thats probably it at 3WPG the leaves are a lot finer and more intricate.
and yes the leaves roll out from the base, very fast growing
Hygrophila difformis, wisteria, is a stem plant. The leaves appear either side of a central stem. Ceratopteris thalictroides and the other species of Indian Ferns are rosette plants, the leaves grow from a substrate level crown.