晶帽石斛 jing mao shi hu

Callista crystallina (H. G. Reichenbach) Kuntze; Dendrobium crystallinum var. hainanense S. J. Cheng & C. Z. Tang.

Stems erect or ascending, cylindric, 60-70 cm, 5-7 mm in diam., slightly fleshy, unbranched, with many nodes, internodes 3-4 cm. Leaves oblong-lanceolate, 9.5-17.5 × 1.5-2.7 cm, leathery, with several dorsiventrally raised veins, base with clasping sheath, apex long acuminate. Inflorescences several, arising from apex of old deciduous stems, 1- or 2-flowered; peduncle short, 6-8 mm; basal sheaths 3 or 4, 3-5 mm; floral bracts pale white, oblong, 1-1.5 cm, membranous, apex acute. Pedicel and ovary 3-4 cm. Flowers spreading, large; sepals and petals creamy white, upper part purplish red, lip orange, upper part purplish red. Dorsal sepal narrowly oblong-lanceolate, ca. 3.2 × 0.7 cm, 5-veined, acuminate; lateral sepals similar in size, 5-veined, base slightly oblique, apex acuminate; mentum narrowly conic, ca. 4 × 2 mm. Petals oblong, ca. 32 × 12 mm, 7-veined, margin ± undulate, apex acute; lip suborbicular, ca. 25 mm, both surfaces densely pubescent, margin entire. Column ca. 4 mm; anther cap narrowly conic, densely white crystalline papillate, front margin irregularly dentate. Capsule elongate, cylindric, ca. 6 × 1.7 cm.

Epiphytic on tree trunks at forest margins or in open forests; 500-1700 m. Hainan, S Yunnan [Cambodia, Laos, Myanmar, Thailand, Vietnam].