Forty-three flowers displayed subumbellately on 5 erect, peduncular inflorescences to 7.0-cm; plant rhizomatous, glabrous, 13.0 cm in width x 8.0 in height growing in 6.35 cm plastic pot with medium bark, roots gray-green with crystalline texture, 0.1 cm in diameter, root tips green; rhizomes rigid, 0.15 in diameter x 1.0 cm long, covered with brown sheaths; pseudobulbs green with purple overlay, ovoid 2.0 cm in diameter x 2.2 cm in height; leaves solitary, elliptic, adaxially green, abaxially dull purple with prominent mid keel, largest leaf 2.0 cm wide x 6.5 cm long, apex obtuse, petiole twisted; flowers uniformly yellow-orange distal half, overlaid maroon proximal half, opening simultaneously; dorsal sepal narrowly ovate, concave at base, 3-veined, apex blunt, sparsely papillose; lateral sepals fused, appearing ligulate, sparsely papillose, adnate to column foot at base, twisted, with median keel from base, upper margin connate down to apex, lower margin connate along two-thirds from the apex; petals ovate, slightly oblique, apex round, 3-veined; lip simple, entire, glabrous, canaliculate, pyramidal, apex blunt to obtuse, recurved, margin somewhat revolute at middle, abaxially with 2 low keels running from base to apex; column short, upper margin with minute obtuse tooth; stigma obscured, rectangular; anther cap yellow brown; ovary somewhat corrugated, 0.1 cm in diameter x 0.5 cm long, maroon; substance medium; texture matte; odor noted; species from Vietnam; plant acquired as Bulbophyllum trongquyetii v. bicolor, denoting the maroon proximal overlay; ID by SITF _____________.