Bulbophyllum pterodon J.J.Verm., Schuit. & de Vogel, Males. Orchid J. 21 (2018) 53
Type: Carr 10282 (holo L; iso K)
Epiphytes. Rhizome 0.35–0.6 cm diam.; rhizome scale leaves not persistent, only few, thin fibers remaining. Pseudobulbs 0.4–2.2 cm apart, distinct, (obliquely) erect, ovoid, 1.0–2.6 by 0.9–1.5 cm, rounded in section, with age wrinkling with numerous longitudinal grooves. Leaf petiole 1.3–3.8 cm long; blade elliptic(-obovate), 5.5–12 by 1.6–3.5 cm, index 3.1–3.8; apex acute. Inflorescences c. 3 cm long, solitary to few in a fascicle, 1-flowered; peduncle c. 0.8 cm long; scale leaves c. 2, the longest c. 0.6 cm long; floral bracts c. 0.55 cm long. Pedicel and ovary c. 1.4 cm long; basal node c. 0.22 cm above the floral bract attachment. Median sepal free, c. porrect, oblong, c. 0.9 by 0.42 cm, index 2.1–2.2, thin; margins entire; apex subacute; glabrous; 5-nerved. Lateral sepals as the median but recurved, oblique, ovate, c. 0.85 by 0.55 cm, index 1.5–1.6; apex (sub-)acute; 4–5-nerved. Petals near their base and for a short distance along their upper margin adnate to the column, porrect, ovate-triangular, c. 0.55 by 0.1 cm, index c. 5.5, thin; margins entire; apex acute-acuminate; glabrous; 1-nerved. Lip about halfway recurved, elliptic to obovate, c. 0.55 by 0.28 cm, index 1.9–2.0 (without spreading) , thick; margins entire, ciliolate; surface glabrous; above deeply concave towards the base, with 2 high, rounded ridges which start near the base at the margins and then converge, reaching up to c. 3/4 along the length of the lip, where they run close together with a deep furrow and a short median ridge in between before they abruptly end by merging with the distinctly convex apical part of the lip; below with a median ridge with a more or less flattened crest in the basal half, apical half concave; apex obtuse. Column including stelidia c. 0.3 cm long; column foot somewhat widened at the apex; stigma obovate, slightly protruding at its base (not certain, only dried specimen seen); stelidia porrect, narrowly triangular to subulate, c. 0.09 cm long, acute, near their base along their upper margin with an antrorse, deltoid, obtuse wing; anther on underside with a narrow, rounded ridge, front drawn-out into a rather thick, slightly concave, triangular, obtuse beak, its surface minutely papillose; pollinia 4, of equal length.
(after Vermeulen, Schuiteman & de Vogel 2018)