Bulbophyllum hortorum, J.J. Vermeulen , P. O'Byrne & A. Lamb. Bulbophyllum Borneo (2015) 57 , fig. 6-7
Type: Vienna Hort, OR 52/2001 (WU).
- Bulbophyllum sp., Ong (2011) 5
- Bulbophyllum stockeri auct. non J.J. Verm.: Ong, (2013) 154
Epiphytes, creeping. Roots scattered along the rhizome. Rhizome 0.45-0.6 cm diam., parts between the pseudobulbs 3.5-5.5 cm long; rhizome scale desintegrating, fibres long persistent, rather thick. Pseudobulbs ovoid to ellipsoid, 0.9-1.5 by 0.5--0.8 cm. Leaf 6.7-9 cm long; petiole 0.7-1 cm long; blade elliptic to ovate, 6-8 by 3.2-4.0 cm, apex 1.7-2.4; obtuse. Inflorescence erect to patent, c. 4 cm long, 1-flowered; peduncle c. 0.6 cm long, with c. 4 scale leaves, the longest c. 0.1 cm long; floral bracts tubular, c. 1.1 cm long; apex acute. Flowers not resupinate, opening wide; pedicel plus ovary c. 2 cm long. Median sepal free, recurved to spreading, ovate, c. 2 by 0.7 cm, index 2.8-2.9; apical part incurved or not; margins entire; apex shortly acuminate; glabrous; c. 7-nerved. Lateral sepals as the median sepal but c. spreading to reflexed, triangular, c. 2 by 1 cm, index c. 2; apex acute. Petals c. spreading, elliptic-ovate, c. 1.6 by 0.55 cm, index c. 2.9; margins entire; apex acute; glabrous, 5-7-nerved. Lip in tapical half slightly recurved, ovate, c. 0.65 by 0.45 cm, index 1.4-1.5 (without spreading); in lateral view the margins well-rounded above the base, entire; glabrous; upper side somewhat concave in the basal 2/3rd, towards the apex slightly convex; underside with a grooved ridge over most of its length; apex obtuse. Column including stelidia c. 0.6 cm long; stelidia porrect, deltoid, c. 0.08 cm long, with rounded apex; anther in front not drawn out; pollinia 4.
(after Vermeulen, O'Byrne & Lamb, 2015)