60. Bulbophyllum retusiusculum H. G. Reichenbach, Gard. Chron. 1869: 1182. 1869.
藓叶卷瓣兰 xian ye juan ban lan
Bulbophyllum flavisepalum Hayata; B. oreogenes (W. W. Smith) Seidenfaden; B. retusiusculum var. oreogenes (W. W. Smith) Z. H. Tsi; Cirrhopetalum flavisepalum (Hayata) Hayata; C. oreogenes W. W. Smith; C. retusiusculum (H. G. Reichenbach) Hemsley; Phyllorkis retusiuscula (H. G. Reichenbach) Kuntze.
Rhizome creeping, ca. 2 mm in diam., rooting from base of pseudobulbs. Pseudobulbs often 1-3 cm apart from each other, rarely close, ovoid-conic or narrowly ovoid, 5-25 mm, 4-13 mm in diam., with a terminal leaf. Petiole short; leaf blade oblong or ovate-lanceolate, 1.6-8 × 0.4-1.8 cm, leathery, base contracted into petiole, apex obtuse and slightly emarginate. Scape from base of pseudobulb, suberect, to 14 cm, slender; umbel many flowered; peduncle ca. 1 mm in diam., sparsely with 3 tubular sheaths; floral bracts narrowly lanceolate, cymbiform, 3-6 mm, apex acuminate. Pedicel and ovary 5-10 mm, slender. Flowers yellow with reddish veins or becoming reddish. Dorsal sepal oblong-ovate or suboblong, 3-3.5 × 1.5-2 mm, abaxially sometimes sparsely papillate in basal half, margin entire or scabrid, apex subtruncate and emarginate; lateral sepals narrowly lanceolate or linear, 11-21 × 1.5-3 mm, abaxially sometimes sparsely papillate, twisted near base, their upper and lower edges connate to each other forming an ellipsoid or horn-shaped synsepal. Petals nearly oblong or ovate, 2.5-3 × ca. 1.8 mm, base ca. 2/5 width adnate to column foot, margins entire or scabrid, apex obtuse-rounded; lip recurved, ligulate, ca. 3 mm, fleshy, base grooved, attached to end of column foot by a mobile joint, apex obtuse. Column 1.5-2 mm, with wings slightly dilated at base; foot ca. 2.5 mm, with free part ca. 1 mm, upcurved; stelidia subtriangular, ca. 0.8 mm; anther cap slightly finely papillate. Fl. Sep-Dec. 2n = 38.
Tree trunks or rocks in forests; 500-2800 m. S Gansu, Guizhou, Hainan, Hubei, S Hunan, Sichuan, Taiwan, S and SE Xizang, W to SE Yunnan [Bhutan, NE India, Laos, Malaysia, Myanmar, Nepal, Thailand, Vietnam].