Lowland Brittle Fern (Southern Bladder Fern)
- Synonyms: Cystopteris fragilis var. protrusa Weath.
- Family: cliff fern (Woodsiaceae)
- Habitat: moist woods
- Height: fronds 6-16 inches long
- Location of spores: undersides of leaflets
- Petiole (leaf stalk): Slender, smooth with a few scales near base. Yellowish-tan to green.
- Growth pattern: asymmetric clump
- Persistence: deciduous
- Origin: native
Underside of a frond, showing the tan sori (spore-bearing structures).