Plants terrestrial, evergreen, long creeping, 50-100 cm. Rhizophores at intervals throughout length of creeping stem and branches, borne on ventral side in axils of branches. Main stems branched throughout, stramineous, 1.3-3 mm in diam. in lower part, stem oval or terete, branches many, once pinnately branched, secondary branches once or twice forked, branchlets sparse, adjacent primary branches on main stem 2-7 cm apart, ultimate branches 10-15 mm wide including leaves. Axillary leaves on main stems larger than those on branches, ovate-lanceolate or triangular, base not peltate, truncate; axillary leaves on branches symmetrical, ovate-lanceolate, 3-4 × 1-1.5 mm, base exauriculate, margin slightly denticulate. Dorsal leaves asymmetrical, those on branches imbricate, ovate-elliptic, 2-3.3 × 1.2-1.7 mm, slightly carinate, base obtuse, not peltate, margin denticulate, apex acute, parallel to axis. Ventral leaves asymmetrical, those on branches distant, approximate, or contiguous, spreading, oblong-falcate, 5-7 mm, apex obtuse; basiscopic margin entire; acroscopic base slightly enlarged, broader, not overlapping stem and branches, margin slightly denticulate. Strobili solitary or in pairs, terminal, compact, dorsiventrally complanate, 4-12 × 1.3-2.6 mm; sporophylls dimorphic, resupinate; dorsal sporophylls ovate-lanceolate, carinate, margin denticulate, apex acuminate, with sporophyll-pteryx incomplete and denticulate; ventral sporophylls ovate, carinate, margin denticulate; megasporophylls in basal portion on lower side of strobilus; microsporangia suborbicular, rather thin, cells uniform; microspores pale yellow, megaspores whitish or brown.
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