ABOVE: Ficus callosa growing next to the Tuaran River in west Sabah. This fig tree is part of a grove of old trees next to a graveyard on the far side of the suspension bridge that crosses the river to give access to the Tuaran Rubber Estate. This bridge is only 3 minutes drive north of Tuaran town. Ficus callosa is locally common in many areas of Sabah including Signal Hill,Kota Kinabalu, Kota Belud, the Tenom valley and Sandakan. There is one record from Brunei but this is a mistake. The only record from Sarawak is from the Talang Talang turtle islands not far from Kuching. There is also one suspect record from Kalimantan.
Note: Botanists often mistake F. callosa for Artocarpus trees (eg. Terap) which are much more common, but Artocarpus fruit are very different apart from the fig mimic Artocarpus nitidus.
Sex: As with all the other 4 species of Section Oreosycea figs found in Borneo Ficus callosa is monoecious (bisexual) with figs producing seeds as well as acting as brood chambers for fig wasps.
Ficus callosa World Range: A patchy distribution from S. India and Sri Lanka east to the Philippines south to Java and east to Timor. Not found in Singapore, southern Borneo, southern Sulawesi and northern Sumatra. The map appears to show a relict distribution indicating that Ficus callosa was once much more widespread but has only survived in the drier more open areas of the original range. Range map from Corner (1970)