Ceratopteris cornuta (Water Sprite)
Ceratopteris cornuta (Water Sprite) growing with long light green fronds and dark submerged leaves.
Botanical name: Ceratopteris cornuta
Common name: Water Sprite
Family: Pteridaceae
USDA Plant Hardiness Zone Map
This medium large aquatic fern grows as submerged, rooted plant as well as free-floating plant.
Link to this plant:
https://toptropicals.com/catalog/uid/ceratopteris_cornuta.htm