G. Rabong (collected as specimens FRI 20671, 20632). It has never been proved that this variation is not clinal or phenotypic. The author visited a stand on Bukit Retak in Ulu Temburong, Brunei where half the trees were like this and half with large leaves like lowland Agathis (TCW 3056-3060). Kostermans (Kostermans 12820, 12897) has made collections from a similarly polymorphic population at 700 m on Mt. Palimasan in north east Kalimantan.