Plants 15-37 cm tall. Rhizomes creeping, strong, 2-3 mm in diam., densely scaly, sometimes becoming naked with age; scales spreading, dark brown with narrow, transparent, colorless margins, iridescent, lanceolate with broadly ovate base, 2-3.5 × 0.5-1.2 mm; lumina mostly opaque, small, square at base, oblong at apex, cell walls thickened. Fronds remote or closely spaced; stipe straw-colored, frond sessile or stipe up to 2(-3) cm, 1.1-1.5 mm in diam., sparsely scaly; lamina reddish brown, gray-brown, or greenish on both surfaces when dried, linear, 12-30(-40) × 0.2-0.4 cm, usually widest 1/3 from base, herbaceous or thinly papery, abaxially with sparse adnate scales, base attenuate, decurrent, margins strongly or slightly revolute when dried, apex shortly acuminate; costa raised on both sides, veinlets slightly visible. Sori restricted to distal 1/3-1/2 of lamina, slightly closer to costa, orbicular or elliptic, 1-2 mm in diam., protruding to give lamina moniliform appearance; paraphyses brown, orbicular, 0.2-0.3 mm in diam., margin entire; central lumina large, transparent, entire.
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