同色金石斛 tong se jin shi hu

Rhizome creeping, ca. 7 mm in diam., internodes ca. 6 mm. Stems pendulous or ascending, pale yellow or golden yellow, ca. 4 mm in diam., usually branching. Pseudobulbs golden yellow, narrowly fusiform, slightly compressed, 5.5-6 cm × 8-13 mm. Leaf blade narrowly elliptic-lanceolate, 11-12 × 1.4-2.2 cm, leathery, acute and slightly bilobed. Peduncle ca. 3 mm, hidden in scalelike sheaths. Flowers only lasting half a day, usually solitary, pure white, thinly textured; pedicel and ovary ca. 5 mm. Dorsal sepal ovate-lanceolate, ca. 8 × 4 mm, acute; lateral sepals similar to dorsal sepal, base broad and oblique; mentum borne at an obtuse angle to ovary, obtuse. Petals narrowly oblong, ca. 10 × 2.5 mm, acute; lip ca. 10 mm, 3-lobed; lateral lobes erect, oblong, ca. 6 × 2.5 mm, rounded; mid-lobe somewhat transversely suboblong, margin inconspicuously erose; disk with 2 longitudinal lamellae extending from base to near base of mid-lobe, and a central keel extending to mid-lobe; lamellae strongly crisped undulate in apical half. Column ca. 3 mm, stout; foot ca. 5 mm. Fl. Jun.

● Epiphytic on tree trunks in forests; ca. 1600 m. S Yunnan.