Agathis borneensis Warb.

Huge tree to 55 m tall. Juvenile leaves ovate-lanceolate, up to 14 by 4 cm. Adult leaves ovate with a more or less acute apex, 6-12 cm by 20-35 mm, tapering at the base to a c. 5 mm petiole. The most common foliage leaf c. 7 by 3 cm but branches with relatively long and narrow leaves often interspersed with the more usual type and more general on younger trees. Resin ducts in pairs one above the other between most vascular strands rather than the prevailing solitary duct elsewhere in the genus. Mature pollen cones oblong, 4-7 cm by 20-25 mm, rounded at the apex, subtended by a 2-10 mm peduncle, the apex of the microsporophyll spoon-shaped, 5.5-6.5 by 4-5 mm, the apex a broad semicircle. Mature seed cones oval, 6-8.5 by 5.5-6.5 cm. Seed bract roughly triangular but well rounded at the upper corners, a low thick ridge along the apical margin, a strongly hooked 6 mm scallop on one side of the base, the other side with no more than a kink, 26-28 by 36-40 mm. Seed c. 12 by 9 mm, blunt at one upper corner and a broadly rounded wing c. 20 by 16 mm at the other corner.

Scattered in upland rain-forest from low elevations to 1200 m throughout its range and in dense nearly pure stands on low-lying sandy peat soil in many parts of Borneo and in one area in Malaya. It is of interest to note that Dacrydium pectinatum has a similar ecology.

Can be grown by cuttings or seedlings.