The Gymnosperm Database


Range of Agathis orbicula (de Laubenfels 1988). Adapted from a map by


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Conservation status 2010: protocol 2.3, needs updating

Agathis orbicula

de Laubenfels 1979

Common Names

Tumuh [Murut]; tubu [Kenyah]; bulok [Iban] (de Laubenfels 1988); Sarawak kauri (Silba 1986).

Taxonomic notes


Tree: Heights to 40 m (Silba 1986).
Bark: Dark brown, exfoliating in irregular plates, with few scattered lenticels; internally granular and reddish-brown; sap produces a yellowish resin (Silba 1986).
Leaves: Oval to circular, obtuse or bluntly acute, closely set, glaucous beneath, 2.4-3.6 × 1.2-2.4 cm, on a short peduncle. Juvenile leaves round, acute, to 6.5 × 2.8 cm, also on a short peduncle (Silba 1986).
Cones: Oval when young, mature dimensions to 7 × 4.5 cm (Silba 1986).
Cone scales: Upper edges of scales imbricate, later elliptic (Silba 1986).
Pollen cones: Ovate or cylindrical, 9-14 × 4-6 mm, on a 2-3 mm long peduncle. Scale apices rounded; exposed parts of microsporophylls 'humpy' (Silba 1986).

Distribution and Ecology

Borneo: Sabah, Ulu Moyah; Sarawak: Bumbong Rumah, at 450-1050 m (Silba 1986). Scattered in rainforest and kerangas on low mountains and plateaus (de Laubenfels 1988).

The IUCN reports that this species is facing a high risk of extinction in the wild due to a limited and severely fragmented distribution, coupled with ongoing decline in extent and quality of habitat.

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See also

The species account at Threatened Conifers of the World.

Last Modified 2017-12-29