Ficus subgelderi Corner, Gard. Bull. Sing. 17 (1960)

Diagnostics
Mid-canopy tree (strangler) up to 34 m tall and 37 cm dbh. Stem with white sap. Stipules ca. 13 mm long, glabrous to hairy. Leaves alternate, simple, tripli-veined, glabrous. Fruits ca. 13 mm diameter, yellow-orange-red, globose figs, placed along the twigs.

Description
Large, monoecious strangler. Twigs slender, irregularly ridged, appressed hairy. Stipules lanceolate, 1.2-1.5 cm long, silky hairy outside, caducous. Leaves coriaceous, glabrous; elliptic to narrowly obovate, 9-14 x 2.5-4.5 cm; base cuneate, margin entire, plane, apex acute; midrib sunken above; lateral veins 5 pairs, with shorter veins in between, raised below, faint above, looping and joining near the leaf margin, basal pair reaching up to 1/2 the length of the blade; intercostal venation reticulate, faintly visible below, invisible above; petiole 1.5-2.5 cm long, appressed hairy, channelled on the adaxial side. Syconia axillary, sessile, ellipsoid to oblong, 1-1.5 x 0.9-1.1 cm; surface rugose on drying, apex flat to slightly depressed; basal bracts prominent, persistent; lateral bracts absent. [from Tree Flora of Sabah and Sarawak]

Ecology
In undisturbed mixed dipterocarp, (peat)-swamp, and keranga forests up to 500 m altitude. Usually on hillsides and ridges, but also in swamps. On sandy soils, but also on clay or limestone.

Distribution
Indo-China, Thailand, Peninsular Malaysia, Sumatra, Borneo.

Local names
Borneo: Akar karak, Beringin, Kara, Kayu ara, Kriwaja, Lunok, Runuk opan.