Mount Mulu
On Mount Mulu in Sarawak, "N. fusca" (found below 1200 m) appears to occupy a discrete altitudinal zone from "N. vogelii" (1200–1500 m) and "N. hurrelliana" (above 1500 m), both of which are also epiphytes. In the Hose Mountains of central Sarawak, "N. fusca" is typically found growing as an epiphyte in lower montane forest at 700–1200 m. It is also an uncommon inhabitant of roadside embankments there.