大叶寄树兰 da ye ji shu lan

Cleisostoma spatulatum Blume, Bijdr. 364. 1825 ["spatulata"]; Aerides densiflora (Lindley) Wallich ex J. D. Hooker; Gastrochilus densiflorus (Lindley) Kuntze; Pomatocalpa densiflorum (Lindley) Tang & F. T. Wang; Rhynchostylis densiflora (Lindley) L. O. Williams; Saccolabium densiflorum Lindley; Sarcanthus densiflorus (Lindley) E. C. Parish & H. G. Reichenbach.

Stems often pendulous, slightly compressed terete, to 50 cm or more long, stout, 7-10 mm in diam., internodes 1-3 cm. Leaves oblong, 10-20 × 2.5-5.5 cm, apex unequally bilobed. Inflorescence opposite to leaf, pendulous, racemose, 10-20 cm, densely many small flowered; floral bracts narrowly lanceolate, 4-5 mm. Flowers yellow with purplish brown spots and stripes, spur whitish; pedicel and ovary ca. 5 mm. Dorsal sepal ovate, 4-5 × ca. 2.5 mm, concave, obtuse; lateral sepals obliquely ovate, 4-5 × 2.5-3 mm, obtuse. Petals ovate, ca. 3 × 2 mm, obtuse; lip 3-lobed; lateral lobes erect, subovate-triangular, ca. 2.5 × 3 mm, obtuse; mid-lobe incurved, ± narrowly lanceolate, ca. 3 × 1 mm, fleshy, obtuse, adaxially with 2 lamellae fused with each other; spur perpendicular to ovary, globose, 5-7 mm, contracted at middle, apex dilated, upper adaxial surface inside with a bifid appendage on back wall and a small callus on front wall. Column ca. 3 mm; anther cap narrowed and beaked at apex. Capsule cylindric, 2-3 cm × 5-8 mm. Fl. Jul-Aug, fr. Sep-Oct. 2n = 38.

Epiphytic on tree trunks in forests, lithophytic on rocks along streamsides; below 1700 m. Hainan [Bhutan, Cambodia, NE India, Indonesia, Laos, Malaysia, Myanmar, Singapore, Thailand, Vietnam].