7. Cleisostoma longioperculatum Z. H. Tsi, Guihaia. 15: 108. 1995.
长帽隔距兰 chang mao ge ju lan
Stems erect, ca. 2 cm, unbranched. Leaves 4 or 5, subbasal, distichous, flat, linear or narrowly oblong, ± V-shaped-conduplicate, ca. 7 × 0.5 cm, fleshy, subacute. Inflorescence lateral, arching, racemose, laxly several flowered; floral bracts ovate-triangular, ca. 1.5 mm, acute. Flowers opening widely, slightly fleshy; pedicel and ovary ca. 6 mm. Dorsal sepal subspatulate or obliquely obovate, ca. 4 × 2 mm, acute; lateral sepals similar to dorsal sepal, obtuse. Petals oblong, ca. 3.5 × 1.3 mm, obtuse; lip lateral lobes suberect, deltoid, apical margin ± incurved; mid-lobe slightly thickened, deltoid, concave, obtuse; spur somewhat horn-shaped, ca. 4 mm, obtuse, interior longitudinally septate, with a back wall callus; callus T-shaped, base slightly bilobed and densely minutely papillate-hairy. Column ca. 1.5 mm; anther cap ca. 2 mm, truncate; pollinia pyriform, with clavate stipe and suborbicular small viscidium. Fl. Jun.
● Epiphytic on tree trunks in mixed forests; ca. 700 m. S Yunnan.