Plants terrestrial, evergreen, ascending from decumbent base, 50-100 cm, with creeping subterranean rhizome and stolons. Rhizophores restricted to creeping rhizomes and stolons. Main stems branched at and above lower part, pinnately branched or anisotomously branched, stramineous, unbranched main stem (5-)15-20 cm tall, main stem 2-2.7 mm in diam. at lower part, subquadrangular or angulate, sulcate, glabrous, apex of main stem not blackish or blackish; primary leafy branches 3-5 pairs, 3 times pinnately branched, secondary branches once or twice pinnately branched, leafy branches pubescent on ventral side, dorsiventrally flattened, ultimate branches 3-7 mm wide including leaves. Axillary leaves on branches symmetrical, oblong-elliptic, 1.4-2.2 × 0.5-0.9 mm, margin entire, base biauriculate, auricles narrowly triangular. Dorsal leaves on branches contiguous, parallel to axis or overlapping at leaf apex, obliquely ovate, 1-2 × 0.4-0.8 mm, not carinate, base obliquely attenuate, margin entire, apex acuminate. Ventral leaves on branches contiguous, slightly ascending, oblong-falcate or falcate, 3-3.6 × 1-1.5 mm, margin entire, apex acute or acuminate; basiscopic base slightly dilated; acroscopic base with triangular auricle, not overlapping stem and branches. Strobili solitary, terminal, compact, tetragonal, 5-10 × 1.5-3 mm; sporophylls uniform, not white-margined, ovate-lanceolate, margin entire, apex acuminate; megasporophylls in upper portion on lower side of strobilus; microsporangia orbicular, rather thin, cells regular; microspores pale yellow, megaspores whitish.
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