Bradley's Spleenwort -

: Initially, the hybrid was sterile, but through a rare natural process of chromosome doubling, it became a fertile, independent species.

Bradley's spleenwort is highly specialized and is often referred to as an "Appalachian spleenwort". bradley's spleenwort

( Asplenium bradleyi ) is a rare, small evergreen fern found primarily in the east-central United States. Named after Professor Frank Howe Bradley, who first discovered it in Tennessee in 1871, it typically thrives in the specialized, harsh environment of acidic rock crevices on sandstone or granite cliffs. Key Characteristics & Identification : Initially, the hybrid was sterile, but through

: It is found from New Jersey and Pennsylvania south to Georgia and Alabama, and west into the Ozarks of Missouri, Arkansas, and Oklahoma. Named after Professor Frank Howe Bradley, who first

: Major threats include habitat destruction from quarrying and mining, mechanical disturbance from rock climbing, and overshading caused by invasive vines or tree growth.

Bradley's spleenwort - Illinois Department of Natural Resources

: It is listed as endangered in states like Illinois , Indiana, and Pennsylvania, and threatened in Ohio .