Ficus retusa is a small rare strangling fig found in areas of poor soils including peatswamp and kerangas (white sand) habitat in Kalimantan and Java.
The appearance of the upper surface of the leaves with 3 prominent sunken veins- the midrib and the paired basal veins is distinctive.
All photos by Ripin Forestry from the hutan kerangas near the town of Pontianank in West Kalimantan.