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Rhizome short-creeping, densely clothed with glossy dark brown hairs. Fronds clustered, erect, (3.5–) 10–50 cm long, scabrid; unbranched portion 1–2 mm wide, subterete, flattened on 1 side, brown near base, clothed with long brown hairs, green above; hairs scattered; sterile frond shorter than sporogenous frond, dividing above middle into a dichotomously branched, flabellate portion, with 20–180 flat asperous acute branchlets; sporogenous frond similar, but branching more open; sporogenous heads 7–15 mm long, 1–3 times longer than broad; segments 3–9 mm long, scabrid; margins with numerous long hairs. Sporangia mixed with hairs.
Rhizome shortly creeping, bearing 1 or 2(-5) erect fronds; hairs on rhizome and stipe bases multicellular, brown to pale brown, ca. 3 mm. Fronds fan-shaped; undivided portion 20-50 cm; stipe not winged and barely distinct from winged portion or lamina, sparsely hairy; upper portion 2-8 times dichotomously divided, lamina-like with lobes 1-1.5 mm wide; whole lamina 10-30 × 7-20 cm, somewhat variable in size. Sporangium-bearing lobes 5-10 pairs arranged pinnately at apex of ultimate frond lobes, lowest ones largest, 3-4 mm; sporangia in 2 regular rows on lobes, with long brown paraphyses.
Rhizome up to 10 mm. diam., clad in dark brown hairs. Stipes (including branches) 15-35 cm. long, about 1 mm. diam., smooth, erect, strict, channelled; branches dichotomous, 4-10 or more, up to 10 cm. long, rather broadly winged, flabellately arranged, with spread of 5-10 cm. or more, narrowed to laminae. Laminae 3-5 mm. long; segs stalked, spreading, about 2 mm. long, fringed. Sporangia distinctly under 0·5 mm. diam.
A fern. It grows 20-40 cm tall. The segments are twice branched.
