台湾水韭 tai wan shui jiu

Plants emergent. Rhizome 2-4-lobed, upper part flat, lower part terete, base margin with thinly membranous materials. Microphylls 15-90 tufted, spreading, spirally arranged, bright green, linear, 7-25 cm, succulent, herbaceous, with cavities, with single vein; peripheral fibrous bundles absent. Ligules triangular and elongate, 1-2.5 mm. Sporangia yellow. Megaspores gray when wet, white when dry, broadly elliptic, 325-425 μm in diam., proximal hemisphere tuberculate to rugulate, distal hemisphere rugate-rugulate with rounded muri irregularly anastomosing. Microspores gray, elliptic, 20-25 μm, spinulose. Spores mature Jul-Oct. 2n = 22*.

● Wetlands and drier places; 100-800 m. Taiwan (Quemoy (Jinmen), Taibei).

The population in Taibei has slightly longer and broader microphylls than that in Jinmen. Molecular data have not yet supported their separation into two species.