Tree, 20-30 m, 20-60 cm ø; buttresses up to 1 m tall; bark smooth or finely fissured, greyish brown. Branchlets initially densely brownish hairy, late glabrescent, lenticellate; terminal buds ovoid, 3-5 by 2-3 mm, scales broadly ovate, densely fulvous tomentose, by simple hairs, glabrescent. Stipules linear-acute, 5-10 by 1-2 mm. Leaves thin-coriaceous, elliptic-lanceolate or elliptic-oblong, 5-15 by 2-5½ cm; base attenuate-acute, asymmetrical, top shortly acuminate; margin remotely serrulate in the apical half; above glabrous, beneath densely pubescent, soon glabrescent; midrib and nerves prominent beneath, flattened or slightly raised above, especially the midrib; nerves 8-10 pairs, parallel, straight, arcuating towards the margin, at an angle of c. 60°; reticulation obscure on both surfaces; petiole 1-3 cm by 1-2 mm. Male rachis c. 6 cm; ♂ flowers: filaments c. 2 mm, anthers ½-1 mm long. Female rachis carrying 2-7 flowers; bracts ovate-acute, 1-2 by 1 mm; staminodes 0-6, styles recurved, 1-2 mm. Young cupule turbinate-obconical or cylindrical-globose, covering the greater part of the fruit, base attenuate; lamellae 5-7, rim thick, entire or denticulate, densely tomentose. Ripe cupule cup-shaped, 1½-2 cm high, ½-2½ cm ø, covering ½-⅓ part of the fruit, rim c. 2 mm thick; lamellae 7-8, densely tomentose. Ripe fruit conical cylindrical, 2-5½ by 1-2 cm; top acute, base rounded; densely tomentose, glabrescent.
Forests in lowland and montane zone, in E. Java up to 2160 m, usually near streams on red sandy clay or ultra-basic soil overlying sandstone or granitic formations. Fertility seems to be irregular. DOCTERS VAN LEEUWEN Zoocecidia 1926 105 and 107 , described some galls from Java and Sumatra, and BACKER & BAKHUIZEN f. hold it, that the large, globose, brown-pilose galls often borne by the twigs of this species, are unknown from other Quercus species in Java.
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Found on red sandy clay overlying sandstone or granite or on ultrabasic soils, growing in mixed dipterocarp forest to montane forest, usually near streams; at elevations up to 2,600 metres.
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