The most common and largest Grapfern at the Park, this species is not a true fern at all. The plants have a single blade and a spore-bearing structure that rises above the leaf. The sporangia resemble little grapes.

The stout blades persist into the next growing season. Leathery Grapefern grows in moist meadows and along forest edges. Formerly known as Botrychium multifidum.