I had missed the pulp color in the photo. One of the sources I found had listed sarawakensis as tabo and a checklist I found for Palawan had listed only sarawakensis as being present there so I guess I assumed this correct. However, i have also been coming across another name -- palau saguit saguit -- that I thought was a synonym in a different dialect that might actually be sarawakensis. One source actually lists "
tabu" as W. edulis, which I believe is synonymous with cochinensis. So it sounds like there are at least two Willughbeia present there.
In any event, it is probably not extremely rare. I have found references to people buying them in markets and there is also a travelog account of someone having been served it in a restaurant (Adventist Hospital Canteen?) in Puerto Princesa.
I have been researching fruits of Palawan as I am considering a holiday there. So far, I am not finding as many Bornean species present as I suspected so it makes me wonder if they are not there or if the documentation of what is there is incomplete...
John
Tabo has white pulp.