Fissidens subangustus Fleischer 1904

Fissidens subangustus looks rather similar to F. crispulus by virtue of the distinct axillary hyaline nodules. However, the leaves of the present species differ in the strongly curled apices when dry, rounded-hexagonal laminal cells with 1–3 minute papillae.

Plants small, green to dark green. Leafy stems simple, 4–5 mm long, 2.0–2.5 mm wide; axillary hyaline nodules well differentiated; cortical stem cells small, thick-walled; central strand not differentiated. Leaves in 6–11 pairs, lower leaves small, upper leaves much larger, densely arranged, distinctly curled at apex when dry; upper leaves narrowly lanceolate, 2.5–3.0 mm × 0.25–0.37 mm; narrowly acute at apex; base of dorsal laminae wedge-shaped, not decurrent; vaginant laminae about 1/2 the leaf-length; costa stout, percurrent; margins minutely crenulate throughout by projections of laminal cells; cells of apical laminae round to round-hexagonal, 5–10 µm long, thin-walled to moderately thickened, bulging, with 1–3 minute papillae; cells of vaginant laminae similar to those of apical laminae, but slightly larger and much larger near costa; limbidia not differentiated on most of the leaves, but marginal cells of vaginant laminae of perichaetial leaves more or less elongated. Dioicous. Female inflorescences terminal on stems. Setae 8–10 mm long, smooth. According to original description, male inflorescences are terminal.

Distribution: China, Japan, India, and Malaysia.

Habitat: on wet rocks, cliff, or soil, side of streams in broad-leaved forest.

Fissidens leptopelma Dix., J. Bombay Nat. Hist. Soc. 39: 773. 1937, syn. nov. Type. India: Assam, Balipara Frontier Tract, 100-300 m alt., N. L. Bor 42 (holotype BM).