Lithocarpus gracilis (Korth.) Soepadmo

Tree 10-40 m, 20-90 cm ø; buttresses up to 1½ m tall, 1 m out, 10 cm thick; bark smooth to fissured, rarely scaly, greyish brown. Branchlets initially angular, densely or sparsely set by silvery to greyish brown, short simple or stellate hairs, later terete, glabrous, greyish to dark brown, sparsely lenticellate; terminal buds subglobose, c. 1-2 by 1½ mm, scales ovate. Stipules ovate to linear-acute, 1½-4 by 0.7-1 mm. Leaves thin-coriaceous, (10-)15-20(-33) by (4-)5-8(-13) cm (index (2-)2½-3(-3.6)), broadest at the middle; above glabrous, dull to glossy, pale to dark brown, underneath with a thin cover of pale brown to glaucous, adpressed, minute stellate hairs; base abruptly acute to cuneate, occasionally asymmetrical, top bluntly acute to 1-1½ cm acuminate-cuspidate; midrib strongly prominent on both sides; nerves (11-)14-16(-17) pairs, thin, prominent on both surfaces, subparallel, at an angle of 45-60°, arcuating but not anastomosing towards the margin; reticulation fine, subscalariform to irregular, distinct beneath; petiole 7-10 mm, 2 mm ø, adaxially flat. Inflorescence male, androgynous or mixed, densely fulvous stellate hairy; bract and bracteoles ovate, c. 1 by ⅓ mm. Male rachis 10-20 cm, 1-2 mm ø, simple and axillary or much-branched and sub terminal; ♂ flowers solitary or in clusters of 3, filaments 3-4 mm, anthers 0.35-0.4 mm long, pistillode subglobose, c. 1 mm ø. Androgynous or mixed rachis 10-15 cm, 1-2 mm ø; female flowers solitary or rarely in clusters of 2-3, staminodes rudimentary, styles 3, conical, c. 1½ mm, connate. Ripe cupule sessile to ½ cm stalked, saucer-to cup-shaped, 0.3-1 cm long, 2-2.7 cm ø; rim thin, covering the basal part of the fruit to c. ⅓ part of the fruit; wall thin, inside densely fulvous to silvery tomentose by adpressed simple hairs, outside densely fulvous to glaucous tomentose by minute, adpressed, stellate hairs; lamellae 6-8, thin, distantly denticulate, more or less concentric. Ripe fruit ovoid-conical, 1.5-1.8 cm long, 1.5-2.6 cm ø, glabrous, dark chocolate-brown to purplish black, top abruptly acuminate, base ro-tundate, scar flat to shallowly concave, 1.4-1.7 cm ø; wall bony, c. 1 mm thick, for the greater part free from the cupule; cotyledons flat-convex.

Primary, sometimes also in secondary and heath forests, on ridges or hills or flat swampy lands, on sandy or rarely limestone derived soil, often on river-banks, up to 1500 m, more commonly below 800 m. Fertility throughout the year.

Can be grown by seedlings.