Species Information - Bulbophyllum leucothyrsus

Bulbophyllum leucothyrsus Schltr., Repert. Spec. Nov. Regni Veg. Beih. 1 (1913) 865

Type: Schlechter 17273 (holo B, lost; iso BM, K)

Synonyms:

• Pelma leucothyrsus (Schltr.) Szlach. & Kulak, Richardiana 7 (2007) 92

Rhizome pendulous, up to 60 cm long, 6-9 mm diam. Pseudobulbs ellipsoid to obovoid, 2.5-8 cm apart, 2.5-7 by 0.8-1.8 cm, moderately flattened. Petiole 1-15 mm. Leaf blade ovate to elliptic, 7.5-25 by 2.1-5.5 cm, index 2.7-6, tip acute. Inflorescence 3.8-22 cm, 4-19-flowered. Peduncle 1.5-3.5 cm; bracts 5-6, the longest 9-13 mm. Rachis 2.5-19 cm. Floral bracts triangular, 4.5-14 mm, tip acute. Pedicel and ovary 2-7 mm, with the node 0.3-4 mm from the floral bract. Flowers hardly opening. Median sepal ovate, 6-12 by 2.2-5 mm, index 2-3.2, tip subacute; thick; glabrous. Lateral sepals often adherent along their lower margins, oblique, 7-13 by 2-4 mm, index 2.5-5.5; otherwise as the median sepal. Petals ovate, 1.8-2.8 by 1.3-2.5 mm, index 1-2.2, tip obtuse to shortly acuminate; margins and often adaxial surface finely papillose; thick. Lip curved, general outline approx. rectangular to obovate, 0.9-1.5 by 0.6-1.2 mm, index 11.7 (not spread), tip rounded; margins finely papillose; thick; surface approx. glabrous to papillose; adx. without a basal concavity, basal teeth an inconspicuous, transverse ridge, basal part of the lip slightly distinctly concave, glabrous to slightly papillose, gradually passing into the convex, (slightly) papillose top part of the lip; abx. without a median ridge, surface glabrous. Column from ovary to the tip of the stelidia 0.7-1 mm; rostellum slightly protruding; stigma a transverse slit, not or slightly protruding at its base; column-foot approx. without accessories. Stelidia inconspicuous, triangular, tip acute. Anther abx. with a wide ridge; front margin hardly protruding. (After Vermeulen, 1993)

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