Appalachian oakfern
Gymnocarpium appalachianum Pryer & Haufler
Appalachian oakfern is a small fern with delicate, broadly triangular fronds. The species was formally described in 1993. Its fertile fronds are usually 10–32 cm long, with much of that length contributed by the slender stalk. International Plant Names Index: Gymnocarpium appalachianumFlora of North America: Gymnocarpium appalachianum
Botanical name
The Appalachian oakfern is Gymnocarpium appalachianum Pryer & Haufler; the supplied citation omits coauthor Haufler. International Plant Names Index: Gymnocarpium appalachianum
Recognizing the plant
The blade is divided repeatedly into pinnae, smaller pinnules and their final segments. Those last divisions tend to be oblong, with rounded ends and smooth or shallowly scalloped margins. The blade’s upper surface lacks hairs; the underside and central axis may be smooth or carry occasional glandular hairs. Distinguishing this fern from close relatives requires attention to the relative lengths and stalks of the lower leaf divisions. Its spores measure about 27–31 micrometres, a useful microscopic character. Flora of North America: Gymnocarpium appalachianum
Native range
This is a local endemic of the Appalachian region, recorded from Maryland, North Carolina, Ohio, Pennsylvania, Virginia and West Virginia. Habitats include rocky maple-birch-hemlock woods and mountain slopes or summits. Some populations occupy moist sandstone or talus where cold air seeps between the rocks. Flora of North America: Gymnocarpium appalachianum
Botanical sources
- International Plant Names Index: Gymnocarpium appalachianum
- Flora of North America: Gymnocarpium appalachianum
Reviewed 2026-10-11. Seasonal development varies with location and growing conditions.