Here is a pic and small description of it from Aquaspot World
http://www.aquaspotworld.com/product/detail/476
From Wikipedia, the free encyclopedia
Bolbitis is a genus of ferns in family Lomariopsidaceae.[1]
Two particular members of the genus are often grown as immersed water plants in aquaria, B. heudelotii, and B. heteroclita. B. heudelotii, the African water fern, normally grows submerged in its native habitat, while B. heteroclita normally grows on the margin of water bodies, but will also grow submerged.