长足石豆兰（中国高等植物图鉴）
Bulbophyllum pectinatum Finet in Bull. Soc. Bot. France 44: 268, t. 7. 1897; 中国高等植物图鉴 5: 729. 图8288. 1976; Seidenf. in Dansk Bot. Ark. 33 (3): 25, fig. 9. 1979; Averyanov, Vasc. Pl. Syn. Vietnam. Fl. 1: 40. 1990; Seidenf. in Opera Bot. 114: 316. 1992; Averyanov, Iden. Guide Vietnam. Orch.: 261. 1994; Z. H. Tsi, S. C. Chen et K. Mori, Wild Orch. China: 94, pl. 141. 1997.
3a. 长足石豆兰（原变种）var. pectinatum
Epiphytic in forests, also found as a lithophyte along ravines; 1000-2700 m. Taiwan, SE to W Yunnan [NE India, Myanmar, N Thailand, Vietnam]. |
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Rhizome 1.8-3 mm in diam., sections between pseudobulbs 0.4-1.2 cm, bract fibers hardly persistent. Pseudobulbs close together, ovoid to almost globose, not or hardly prostrate proximally, 1.1-2.5 × 0.6-1.5 cm. |
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Petiole 0.3-1.5 cm; leaf blade elliptic to ovate, 3-8 × 0.9-2.3 cm, rounded to obtuse. |
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Inflorescence erect to spreading, 6-10 cm, 1-flowered; peduncle 1.2-4.5 cm; bracts ca. 3, longest 6-9 mm; floral bracts tubular for 2/3 or more of their length, 6.5-14 mm, acute. Flowers resupinate, opening wide, pale greenish, often with fine reddish purple spots mainly along veins; lip pale green to white, stained or finely spotted with reddish purple. Pedicel and ovary 32-60 mm. Dorsal sepal recurved with top incurved, ovate, 13-23 × 5-13 mm, rather thin, glabrous, base rather narrowly attached, margin entire, apex obtuse to acute; lateral sepals free, recurved to spreading, elliptic to ovate-triangular, 15-26 × 11-14 mm, (sub-)acute, rather broadly attached, otherwise as dorsal sepal. Petals recurved to spreading, elliptic to ovate-triangular, 10-19 × 5-11 mm, rather thin, glabrous, base rather broadly attached, margins entire, apex obtuse to acute; lip recurved to almost reflexed at ca. 2/3 of its length, ovate-triangular, 10-16 × 7-18 mm (all without artificial spreading), thick but proximally thin toward margins; abaxially with a retuse median ridge up to ca. 2/3 of length of lip, surface glabrous; adaxially deeply concave proximally, with 2 retrorse, dorsiventrally flattened, rounded lobes close together and covering ligament, toward top slightly concave grading to distinctly convex and with 2 well-spaced, high, narrow, papillose ridges with a deeply erose crest, adaxially papillose-verrucose distally and sometimes in between ridges, surface otherwise glabrous, margins erose-lacerate, more deeply so proximally, apex obtuse. Column 2.5-5 mm, stigma inside with 3 keels, at its base without teeth, column foot without a tooth above ligament; stelidia deltoid, 1-2 mm, obtuse; anther abaxially ± glabrous and with a rounded crest; front margin drawn out, erose; pollinia with a fleshy stipe firmly attached to their bases. Fl. (Mar-)Apr-Jul(-Sep). |
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3b. 阿里山石豆兰（变种）
var. transarisanense (Hayata) S. S. Ying in Col. Ill. Orch. Fl. Taiwan 1: 138, 143. 1996. ——Bulbophyllum viridiflorum Hayata, Icon. Pl. Formos. 2: 133. 1912, et 51, fig. 20. 1914, non Schltr. 1910. ——B. transarisanense Hayata, 1. c. 6: 73. 1916; Schltr. in Fedde Repert. Sp. Nov. Beih. 4: 250. 1919; S. Y. Hu in Quart. J. Taiwan Mus. 25 (1, 2): 63. 1972; 台湾兰科植物彩色图鉴 2: 426. 1977; 台湾植物志 5: 902. 图1556. 1978. ——B. transarisanense Hayata f. alboviride Fukuyama in Masamune, List Vasc. Pl. Taiwan: 167. 1955.
本变种区别于原变种在于花浅黄绿色无密布的紫褐色斑点，侧萼片的下侧边缘在中部以上骤然向先端缢缩，花瓣先端锐尖；唇瓣两侧边缘在中部以下具钝的锯齿。花期5月。
产台湾（南投、台东、嘉义、桃园）。生于海拔约1000米的常绿林中树干上。