Plants terrestrial or epilithic, 10-50 cm tall. Rhizomes erect, short, scales dark brown, lanceolate, margins denticulate. Fronds clustered; stipe castaneous, glossy, 6-25 cm, terete, base with same scales as rhizome, distally glabrous; lamina 1-pinnate, lanceolate in outline, 12-25 × 2-6.5 cm; rachis, costae, and stalks same color as stipe, apex usually prolonged into a whiplike stolon and rooting to form new plantlets; pinnules 6-12 pairs, alternate, obliquely spreading; stalk 10-20 mm, articulate, persistent after pinnules fall; blade below middle subequal in size, dimidiate-lunate or semi-orbicular-reniform, 1-4 × 1-2.3 cm, herbaceous, green or brown-green, both surfaces glabrous, upper margin rounded, apex obtuse or bent downward, sterile pinnules stalked, both sides asymmetrical; margins undulate-lobed, segments obtuse and serrulate at apex, lower margins entire, truncate or slightly bent downward, rarely broadly cuneate, fertile pinnules subentire or with 2-4 shallow sinuses, or slightly undulate; distal pinnules slightly smaller; terminal pinnules flabellate, slightly larger than basal pinnules; veins multidichotomously forked and reaching margins, visible on both surfaces. Sori 2-6 per pinna; false indusia dark brown or brown-green, linear-oblong, membranous, upper margins flat and straight or slightly depressed, entire, persistent. Perispore finely granular.
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Rhizome short-creeping, erect or suberect, to 5 mm diam.; scales yellow to dark red-brown, often bicolorous, with entire or scarcely serrate margins and blunt apical seta. Fronds tufted, arching, to 40 cm long. Stipe to 15 cm long, glabrous. Lamina 1-pinnate, narrowly triangular, 10–22 cm long, 3–6 cm wide; rachis glabrous, occasionally extended past lamina and ending in proliferous bud. Pinnules subdimidiate, rounded-trapeziform or semi-circular to almost lunate, glabrous; basal angle acute on upper pinnules, usually obtuse on lower ones; distal margin entire or irregularly lobed, scarcely denticulate when sterile; stalks articulated to rachis. Sori 1–10 per segment, occupying entire lobe margin; soral flaps linear to sublunate, glabrous. Spores 64 per sporangium, dark brown; perine granulate, loosely adhering to exine; largest diam. (35–) 52.3 (–68) µm.
Weed in cultivated ground and on walls, sometimes on rocks, in damp shaded spots; up to 4, 000 ft. alt.
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Terrestrial along creeks or among rocks, or lithophytic.
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