针叶石斛（植物分类学报）
Dendrobium pseudotenellum Guillaum. in Bull. Mus. Nat. (Paris) ser. 2, 36, 5: 697. 1965; Seidenf. in Nord. J. Bot. 1 (2): 203, fig. 8. 1981; Averyanov, Vasc. Pl. Syn. Vietnam. Fl. 1: 80. 1990; Seidenf., l. c. 114: 244, fig. 155. 1992; Averyanov, Iden. Guide Vietnam. Orch.: 212. 1994; Z. H. Tsi et S. C. Chen in Acta Phytotax. Sin. 33 (3): 293. 1995.
Epiphytic on tree trunks in mountain forests; ca. 900 m. S Yunnan (Mengla) [Vietnam].
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Stems erect, rigid, slender, basal 2 internodes swollen to forming fusiform pseudobulb, others cylindric, 30-43 cm, ca. 2 mm in diam., unbranched, with many nodes, internodes 1-3.5 cm, yellowish brown when dry, glossy. |
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Leaves sparsely distichous, ascending, subterete, slender, 3-9 cm, less than 1 mm wide, fleshy, base with tightly clasping sheaths, apex acute. |
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Peduncle ca. 2 mm; basal sheaths 4 or 5, overlapping; floral bracts ovate, ca. 1.5 mm, acute. Pedicel and ovary ca. 5 mm, slender. Flowers very small, thin, white. Dorsal sepal oblong, ca. 6 × 2.2 mm, 3-veined, obtuse; lateral sepals obliquely ovate-triangular, much larger than dorsal sepal, base very oblique, apex slightly acute; mentum narrowly conic, ca. 9 mm, obtuse. Petals oblong, ca. 6 × 2 mm, 3-veined, obtuse; lip obovate, ca. 11 × 7 mm, margin lacerate-fimbriate, apex 3-lobed; lateral lobes erect; mid-lobe nearly transversely oblong, apex concave; disk with 3 central ridged projections, dilated into plicate ridges at base of mid-lobe. Column ca. 2 mm, foot ca. 8 mm, with a basal callus; anther cap nearly glabrous, apex subtruncate. |
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