Thelasis taiwaniana (Fukuy.) S. S. Ying
Pseudobulbs tufted or closely spaced on creeping rhizome, compressed globose, disc-like, 5-8 mm in diam., 1- or 2-leaved at apex. Leaves when 2 present usually with one larger, linear or oblong, 1.5-5 cm long, 3-8 mm wide, apex acute, cuneate and decurrent at base, articulated with sheaths, midrib sulcate on upper surface, elevated on lower surface. Peduncle arising form base of pseudobulb, slender, 38 cm long, with 4 scales below; rachis ca. 2 cm long; bracts elliptic, 2.8 mm long; pedicel and ovary 2.5 mm long. Flowers ca. 10, white, perianth more or less spreading, ca. 3 mm in diam.; dorsal sepal ovate-triangular to elliptic, 2-2.5 mm long, 1-1.2 mm wide, apex obtuse; lateral sepals obliquely ovate, 2.5 mm long, 2 mm wide, apex acute; petals ovate 2 mm long, 1.2 mm wide, acute; lip erect on foot of column, 2.5 mm long, 1.5 mm wide when expanded, base narrow, concave or shallowly saccate, widened into broad limb, limb broadly ovate, concave; column ca. 0.5 mm tall, foot ca. 1.5 mm long; anther cordate, 0.8 mm long; pollinia ovoid-ellipsoid, attached in 2 groups of 4 through slender caudicle to narrow viscidium.
NANTOU: Shihken, Lin 742. HUALIEN: Tali, Su & Liao s. n, May 1978. TAITUNG: Linungshan, Su 7857*.
Endemic, rare, moist forests below 1,500 m.