Plants small, yellowish green. Leafy stems simple, 2.2–3.0 mm long, 1.5–2.5 mm wide; axillary hyaline nodules distinctly differentiated; central strand not differentiated. Leaves in 5–15 pairs, densely arranged, complanate, not crisped when dry, lower leaves smaller, middle to upper leaves larger, narrowly lanceolate, 1.2–1.8 mm × 0.2–0.3 mm, acute at apex; bases of dorsal laminae wedge-shaped; vaginant laminae ca. 2/3 the leaf length, nearly equal; margins entire, bordered throughout by differentiated cells, 1–2 rows of cells at upper margins, 3–4 rows of cells at lower margins, one cell thick in cross section; costa strong, yellowish brown, shortly excurrent; cells of apical and dorsal laminae quadrate to irregularly hexagonal, 3.5–10.5 µm long, thin-walled, obscure, densely minutely papillose; cells of vaginant laminae similar to those of apical and dorsal laminae, but larger at base near costa. Sporophytes not seen.

Type. Indonesia: North Borneo, Mt. Kinabalu, Iwatsuki 160 (holotype NICH).

Chinese specimens examined: GUANGDONG: Ding-hu Shan (Mt.), Iwatsuki & P.-J. Lin 19704 (IBSC, NICH), Z.-H. Li & P.-J. Lin 156 (IBSC, SYS), Magill et al. 8080 (MO). YUNNAN: He-kou Co., W.-X. Xu 424 (HKAS, NICH).

Habitat: on soil in partially shaded areas; Distribution: China and Indonesia.

Illustrations: Pl. 83, figs. 1–13.