Oberonioides microtatantha (Schlechter) Szlachetko, Fragm. Florist. Geobot., suppl. 3: 135. 1995.

小沼兰 xiao zhao lan

Microstylis microtatantha Schlechter, Repert. Spec. Nov. Regni Veg. Beih. 4: 192. 1919; Malaxis microtatantha (Schlechter) Tang & F. T. Wang; M. tairukouensis S. S. Ying; Microstylis minutifloraRolfe (1908), not Schlechter (1899); M. pusilla Rolfe.

Plants terrestrial, small. Pseudobulbs ovoid or subglobose, 3-8 × 2-7 mm, ± enclosed by white, thin and membranous sheaths. Leaf solitary, nearly appressed to substrate; petiole 5-10 mm, amplexicaul; leaf blade ovate to broadly ovate, 1-1.5(-2) × 0.5-1.3 cm, base subtruncate, apex acute. Inflorescence erect; peduncle often purple, slightly compressed, slender, both sides with very narrow wings; rachis 1-2 cm, usually 10-20-flowered; floral bracts broadly ovate, ca. 0.5 mm, ± embracing pedicel. Flowers yellow, very small; pedicel and ovary 1-1.3 mm, conspicuously longer than bracts. Dorsal sepal broadly ovate to nearly oblong, 1-1.2 × ca. 0.7 mm, margin revolute, apex obtuse; lateral sepals triangular-ovate, similar to dorsal sepal in size. Petals linear-lanceolate or sublinear, ca. 0.8 × 0.3 mm; lip inferior, sublanceolate-triangular or ligulate, ca. 0.7 × 0.6 mm, 3-lobed, apex subacuminate; lateral lobes linear or narrowly oblong, 0.6-0.7 × 0.2-0.3 mm, usually erect and enfolding column. Column ca. 0.3 mm, stout. Fl. Apr.

● Forests, humid and shaded rocks; 200-1800 m. N Fujian, C Jiangxi, E Taiwan.