Asplenium × trudellii, commonly known as
Trudell's spleenwort, is a rare hybrid fern of the eastern United States, first described in 1925. It is formed by the crossing of mountain spleenwort (
A. montanum) with lobed spleenwort (
A. pinnatifidum). Trudell's spleenwort is intermediate in form between its two parents, and is generally found near them, growing on exposed outcrops of acidic rock. While
A. × trudellii is triploid and sterile, there is some evid
(Wikipedia)