Castanopsis tungurrut (Blume) A.DC., J. Bot. 1 (1863)
Latin for the local name of this species.

Synonyms
Castanea tungurrut Blume, Castanea tungurrut forma sumatrana Miq., Castanopsis conspersispina Merr., Castanopsis ridleyi Gamble

Description
Mid-canopy tree up to 37 m tall and 92 cm dbh. Stipules ca. 5 mm long. Leaves alternate, simple, penni-veined, glabrous. Flowers ca. 1.5 mm diameter, yellowish, placed in racemes. Fruits ca. 30 mm long, green-reddish, nut completely enclosed by spiny cupule.

Ecology
In undisturbed mixed dipterocarp forests up to 700 m altitude. Along rivers and on hillsides. In secondary forests usually present as a pre-disturbance remnant tree.

Distribution
Peninsular Malaysia, Sumatra, Java, Borneo (Sabah, East-Kalimantan).

Local names in Borneo
Barangan.