1. Pantropical aquatic fern
   - Ceratopteris thalictroides 
2. Aquatic fern of tropical America often used in aquariums
   - water sprite, Ceratopteris pteridioides 
3. Small free-floating aquatic fern from the eastern United States to tropical America; naturalized in western and southern Europe
   - mosquito fern, Carolina pond fern, Azolla caroliniana

Derived forms: floating ferns

Type of: aquatic fern, water fern

Part of: Azolla, Ceratopteris, genus Azolla, genus Ceratopteris

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