Castanopsis acuminatissima (Blume) A.DC., J. Bot. 1 (1863)
Latin for 'strongly pointed'.

Synonyms
Castanea acuminatissima Blume, Castanea sessifolia Blume, Castanopsis bejaudii A.Camus, Castanopsis junghuhnii (Miq.) Markgr., Castanopsis longispicata Hu, Castanopsis nebularum Hickel & A.Camus, Castanopsis schlenkerae Bailey, Pasania acuminatissima Oerst., Quercus acuminatissima (Blume) A.DC., Quercus fagiformis Jungh., Quercus junghuhnii Miq., Quercus varingaefolia Miq., Synaedrys fagiformis Koidz.

Description
Upper canopy tree up to 42 m tall and 71 cm dbh. Stipules ca. 3.5 mm long. Leaves alternate, simple, penni-veined, glabrous. Flowers ca. 3 mm diameter, white-yellowish, placed in racemes. Fruits ca. 22 mm long, green-yellow, nut completely enclosed by warty cupule.

Ecology
In undisturbed mixed dipterocarp to sub-montane forests up to 2000 m altitude. Mostly on hillsides and ridges with sandy to clay soils. In secondary forests usually present as a pre-disturbance remnant tree.

Uses
Fruit is edible.

Distribution
From India and South China to New Guinea. In Borneo recorded from Sarawak, Sabah, West- and East-Kalimantan.

Local names in Borneo
Berangan, Berangan pipit, Empili, Kogopon, Mempening, Ukam.