Tree c. 25 m. Twigs with two low wings or sharp ridges between the petioles, 4-5 mm diameter, early glabrescent, hairs less than 0.1 mm; older twigs tending to crack and flake; lenticels inconspicuous. Leaves thinly chartaceous, elliptic-oblong or oblong-lanceolate, 12-25 by 4.5-10 cm, base rounded, apex ± blunt or subacute; upper surface (blackish) brown, lower surface grey-brown, seemingly glabrous, hairs scattered, whitish, scale-like, less than 0.1 mm; not papillose, dots absent; midrib slightly raised above, lateral nerves 20-30 per side, faint and flat above, lines of interarching and venation indistinct, somewhat impressed above, and rendering the blade slightly bullate; petiole 15-20 by 2.5-4 mm; leaf bud 10 by 2 mm, seemingly glabrous, but hairs appressed, grey-white, less than 0.1 mm. Inflorescences (from infructescences): just below the leaves, of the Knema-type: sessile, small, glabrous. Male and female flowers not known. Fruits (somewhat immature) solitary, subglobose, 5(-6) by 4-5 cm, strongly wrinkled, apex ± acute, hairs ± sparse, dull brown, less than 0.1 mm, with a tendency to become glabrous; pericarp 2 cm thick; seeds (immature) subglobose or broadly ellipsoid, 2 cm; fruiting pedicel stout, straight, 10-20 by 4-6 mm, glabrescent, hairs minute, scattered, and scale-like, ± warty or lenticellate, bracteole scar at 1/3 to halfway below the apex, perianth scar conspicuous, apical.
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