Ficus cavernicola is very rare in herbarium collections but locally common around the Kinabalu Park buildings at Mesilau climbing up the forest trees surrounding the clearing. See for example 3 of the four trees on the RHS of the photograph above, which are covered in root climbing Ficus cavernicola lianas.

The closest relative  to F. cavernicola is obviously Ficus ruginerva  but as yet there is no detailed research to  compare the differences between the two species and it may eventually turn out that they are conspecific i.e. the same species.

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Note that there are 3 fig fruit in the photo above.

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Kinabalu landslides  -17th March 2017 AP (55) ENHANCED FOR MESILAU  - Copy.JPG
The white areas on the blue granite show the location of massive landslides following an earthquake in June 2015. Mesilau was badly affected.
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The earthquake of  June 2015 destroyed the access road to Mesilau and damaged many of the park buildings. Mesilau is no longer accessible to visitors.