Tree 10-30(-40) m. Twigs 2-3 mm diameter, early glabrescent, hairs 0.1 mm or less, sometimes yellowish; older twigs dark brown or blackish, coarsely striate, sometimes flaking; lenticels absent. Leaves membranous or thinly chartaceous, oblong(-lanceolate), 15-30 by 4-9 cm, base short-cuneate or rounded, apex acute-acuminate; upper surface olivaceous(-brown), lower surface grey-brown, with persistent dense but thin felty or arachnoid covering of intricate greyish brown hairs 0.1 mm or less, hardly to be felt with the finger (lens!); not obviously papillose; dots absent; midrib above flat or ± raised, lateral nerves 16-23 per side, flat or sunken above, sometimes indistinct, at 45-80° to the midrib, lines of interarching distinct or not, venation faint on both surfaces (distinct, scalariform in ZainalAbidih 23, from Nunukan I.); petiole 10-25 by 1.5-3 mm; leaf bud 10-15 by 1.5-3 mm, hairs 0.1-0.2 mm. Inflorescences between the lower leaves, pedunculate, slender, hairs woolly, 0.1-0.3 mm; in male: 2-3.5 cm, peduncle 5-10 mm, slightly flattened, lowest branches (sub)opposite, to 5 mm, ending in a subumbel of flowers, central axis 20-30 mm, with 2-4 sessile subumbels, each with 4-8 flowers, buds of strongly variable sizes, hairs persistent, woolly, (0. l-)0.2-0.3 mm; bracts broadly rounded, 1.5-2 mm, pubescent, caducous; female inflorescences as males but smaller. Male flowers: pedicel 3-3.5 mm, bracteole often ± 2-topped, 2 mm; buds firm, ovoid or ellipsoid, 3-4 by 2.5-3 mm, apex ± rounded, not or hardly angled, cleft 3/4-4/5, lobes 0.5-0.8 mm thick. Androecium short and broad, somewhat club-shaped, 1.5 mm; androphore 0.3-0.5 by 0.8 mm, minutely pubescent (apparently glabrous in immature flowers of bb 27505 from Sumatra); synandrium broadly ellipsoid, 1-1.3 by 1-1.2 mm, the sterile apex absent, the apex truncate and ± hollowed for up to 0.3 mm, the edge ± lobed corresponding with the anthers, thecae 12-16(-20), 1 mm long, not tightly contiguous. Female flowers not seen. Infructescence 0.5-2 cm, with 1 or 2 fruits. Fruits ellipsoid (-oblong), 5-7 by 3-4.5 cm, apex and base broadly rounded, hairs dense, scurfy, 0.1 (-0.2) mm; pericarp (2-)3-6(-10) mm thick; seeds ellipsoid, 4-5 cm; fruiting pedicel ± stout, roughly fissured or cracked, 3-5 mm.
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