lowland bladderfern
- kingdom: Plantae
- phylum: Tracheophyta
- class: Polypodiopsida
- order: Polypodiales
- family: Cystopteridaceae
- genus: Cystopteris
- species: Cystopteris protrusa
- Florence
- Northport
- Sheffield
- Tuscaloosa
Alabama- Mishawaka
Indiana- Cabin John
Maryland
United States