42. Bulbophyllum gymnopus J. D. Hooker, Fl. Brit. India. 5: 764. 1890.
线瓣石豆兰 xian ban shi dou lan
Drymoda gymnopus (J. D. Hooker) Garay, Hamer & Siegerist; Phyllorkis gymnopus (J. D. Hooker) O. Kuntze.
Rhizome 2.5-4.5 mm in diam., sections between pseudobulbs 3-22 cm; bracts densely spotted with purplish brown when young, soon withering, including veins. Pseudobulbs distant, ovoid, 1.2-4 × 0.8-1.5 cm. Petiole 1-3.5 cm; leaf blade elliptic, 4.8-17 × 1-3.2 cm, obtuse. Inflorescence a lax raceme, erect to spreading, 7-23 cm, 7-28-flowered; peduncle 1.8-7 cm; bracts 4-6, longest 5-17 mm; rachis 5-17 cm; floral bracts ovate to triangular, 1.8-3.5 × 1-1.8 mm, acute. Flowers resupinate; white, pale greenish white, or yellowish, lip yellow or orange, column white to orange. Pedicel and ovary 8-10 mm. Dorsal sepal ovate to triangular, 4.5-7 × 1.4-2.2 mm, thin, surface glabrous or slightly papillose toward tip abaxially, base narrowly attached, margins entire, apex emarginate, rounded to acute; lateral sepals falcate, 5-8 × 1.4-2.5 mm, obtuse, otherwise as dorsal sepal. Petals recurved, falcate, linear with a wide base, 3-5.5 × 0.4-0.7 mm, thin, base broadly attached, margins erose toward tip, apex obtuse to acuminate; lip recurved slightly below middle, ligulate, 2-4 × 0.8-1.3 mm, thick, surface glabrous, abaxially with a distinct, deeply emarginate ridge up to ca. 1/3 of length of lip, adaxially concave near base, often with 2 inconspicuous, obtuse ridges ca. halfway up lip, space in between 2 ridges somewhat channeled, margin of lip entire, glabrous or finely papillose locally, apex obtuse. Column 2-3 mm, foot elongated so that a gap exists between petals and lateral sepals; stelidia triangular, 0.4-1 mm, acute. Fl. Jan-Mar, Oct-Dec.
Epiphytic or lithophytic in montane and evergreen forests; 600-2000 m. S Yunnan [Bhutan, India, Thailand].