南洋厚壁蕨 nan yang hou bi jue

Didymoglossum holochilum Bosch, Pl. Jungh. 1: 561. 1856; Hymenophyllum subdimidiatum Rosenstock; Leptocionium holochilum (Bosch) Bosch; Meringium holochilum (Bosch) Copeland.

Plants 5-10 cm tall. Rhizome long creeping, filiform, slender, sparsely hairy. Stipe brown, ca. 3 cm, slender, sparsely hairy, very narrowly winged. Rachis hairy on lower surface, usually winged throughout, wings entire. Lamina bipinnate to tripinnatifid, lanceolate to oblong-lanceolate, 4-6 × 1.5-2 cm; pinnae 5-7 pairs, closely spaced, alternate, subsessile, broadly ovate, oblique, unequally cuneate at base, with 3-6 segments; ultimate segments simple, rarely forked, closely spaced, linear, with a single veinlet, margin sparsely toothed, apex obtuse. Veins dichotomous, brown, obvious on each surface. Sori large, apical on short acroscopic segments; involucres ovate to elliptic, narrowly winged, cleft to 1/3-1/2, lips entire and slightly revolute; receptacles projecting.

On trees in tropical evergreen forests; 700-1400 m. Taiwan [Malesia, Thailand; Pacific islands (Melanesia, Micronesia, Polynesia)].