Castanopsis hypophoenicea (von Seemen) Soepadmo, Reinwardtia 7 (1968)
Latin for 'purper coloured lower surface'.

Synonyms
Castanopsis dispersispina Merr., Lithocarpus hypophoenicea (von Seemen) Barnett, Quercus hypophoenicea von Seemen

Description
Mid-canopy tree up to 38 m tall and 71 cm dbh. Stipules ca. 4 mm long. Leaves alternate, simple, penni-veined, hairy below. Flowers ca. 1 mm diameter, green-yellow, placed in racemes. Fruits ca. 83 mm long, green-yellow-brown, nut completely enclosed by cupule with long spines.

Ecology
In undisturbed to slightly disturbed mixed dipterocarp and sub-montane forests up to 1300 m altitude. Mostly on hillsides and ridges, but also along rivers. Usually on sandy soils. In secondary forests usually present as a pre-disturbance remnant tree.

Uses
The fruit is edible.

Distribution
Borneo (Sarawak, Brunei, Sabah, Central- and East-Kalimantan).

Local names in Borneo
Bangan, Berangan, Berangan bo, Bibi, Wau.