Greek: From oreos, mountain, + pteron, wing, describing the pinnae. But note that pteris was used by ancient Greeks to describe all ferns. Oreopteris is a fern of the mountainous regions.
Rhizome: erect, triangular scales.
Frond: deciduous, monomorphic.
Stipe: grooved above (not continuous), scaly, vascular bundles: 2, crescent-shaped.
Blade: 1-pinnate to pinnate-pinnatifid, lanceolate to ovate, transparent needlelike hairs, glandular.
Pinnae: shortened towards the base, becoming extremely small, costae grooved above or not, veins free.
Sori: round or oblong, near the margins, indusium: small or absent.
Yellow glands on lower surface, hairs on costae, pinnae becoming tiny at the base.