Cystopteris tennesseensis

Cystopteris tennesseensis, commonly known as the Tennessee fragile fern or Tennessee bladderfern, is a species of fern in the family Cystopteridaceae.

Description
Cystopteris tennesseensis is a lithophytic fern, growing on calcareous rock ledges, scree, and cliffs. It has creeping rhizomes, and occasionally has misshappen bulbets.

Cystopteris tennesseensis is a member of the Cystopteris hybrid complex. It originated as an allotetraploid hybrid between two diploid parents, C. bulbifera × C. protrusa.

Distribution
The fern is native to the eastern United States. It occurs in the states of: Ala., Ark., Ga., Ill., Ind., Iowa, Kans., Ky., Md., Mo., N.C., Ohio., Okla., Pa., Tenn., Va., W.Va., Wis.