Ficus sundaica is one of only a few Section Conosycea figs which can be found in peat swamp forest. Other typical peat swamp figs include F. spathulifolia, F. tristaniifolia and F. crassiramea. F. sundaica Form A has smaller leaves and larger figs than F. sundaica Form B.
All photographs by Ripin Forestry in peat swamp forest near Pontianak, West Kalimantan taken in March 2020.
Note the forest path through the swampy ground at bottom right