Thelypteridaceae
Indument of transparent needlelike hairs, general absence of blade scales, stipe vasculature with two crescent-shaped bundles, generally 1-pinnate to pinnate-pinnatifid blades. Here 3 genera.

Oreopteris Holub
Etymology 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.
Description 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.
Distinctive Characteristics Yellow glands on lower surface, hairs on costae, pinnae becoming tiny at the base.
Oreopteris
Oreopteris. The yellow glands, hairs on the axes, and miniscule-to-vanishing indusia are required charaters.  Illustration from Scandinavian Ferns by Benjamin Ĝllgaard and Kirsten Tind, Rhodos, 1993.

Phegopteris (C. Presl) Fée

Beech fern

Etymology Greek: phegos, beech + pteris, fern. The original name for Phegopteris connectilis was Polypodium phegopteris, the beech fern.
Description Rhizome: long-creeping, ovate scales.
Frond: deciduous, monomorphic.
Stipe: straw-colored at base, scales tan, lanceolate, below, and pointed hairs on both sides, vascular bundles: 2, crescent-shaped.
Blade: pinate-pinnatifid, triangular to ovate, transparent needlelike hairs and spreading, ovate-lanceolate scales on rachis below.
Pinnae: base fused to rachis, and often connected by wings, costae not grooved, spreading, ovate-lanceolate scales below, veins free, simple or forked.
Sori: round to oblong, beyond the middle to submarginal, indusium: absent, sporangia: tan.
Distinctive Characteristics The broad connection of the pinnae along the rachis (adnate) and winged tissue between adjacent pinnae is distinctive.
Phegopteris blade adnate
Phegopteris. The pinnae attached broadly along the base (adnate) to the rachis and the wings between pinnae are diagnostic.  Illustration from Scandinavian Ferns by Benjamin Ĝllgaard and Kirsten Tind, Rhodos, 1993.

Thelypteris Schmidel

Female fern

Etymology From the Greek. Thelys means female, + pteris, the word for ferns in general.
Description Rhizome: long-creeping, triangular scales.
Frond: deciduous, monomorphic or somewhat dimorphic.
Stipe: scaly, vascular bundles: 2, crescent-shaped.
Blade: 1-pinnate to pinnate-pinnatifid, lanceolate to ovate, transparent needlelike hairs, sometimes glandular.
costae grooved above, discontinuous with the rachis, veins free.
Sori: round or oblong, medial to supramedial or elongate along veins, indusium: reniform, occasionally ephemeral, at a sinus.
Distinctive Characteristics Members of the genus are pinnate with deeply lobed pinnae, have two vascular bundles, sori with a kidney-shaped, short-lived indusium, and needle-like, translucent or white hairs on the lamina, rachis, stipe.
Thelypteris kunthii
Thelypteris kunthii.White or translucent hairs are indicative of Thelypteris; the sori are covered with a reniform (kidney-shaped) indusium, which may be ephemeral.
 George Yatskevich at discoverlife.org

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