Note the similarity of the leaves of Ficus geocharis to the leaves of Ficus hemsleyana which grows in the same area.
These two fig species are in different Ficus sections. F. geocharis is an earth fig in Section Sycocarpus whilst F. hemsleyana is a hemi-epiphyte in Section Sycidium.
Thanks to Tim Hatch and Peter Boyce of Rescuing Borneo for photos and information.