These tiny leaves are believed to be the juvenile bathyphyll leaves of Ficus  lanata.

See these photos of the adult leaves at the Royal Mulu Resort in N. Sarawak

All photos by Shuai LIAO. Collection # 20190333 taken at Kinabalu Park HQ on 6 September 2019.

00 Ficus excavata Kinabalu Park●20190333★ Shuai LIAO

01 Ficus excavata Kinabalu Park●20190333★ Shai LIAO

04 Ficus excavata Kinabalu Park●20190333★ Shuai LIAO-LSL_8351

05 Ficus excavata Kinabalu Park●20190333★ Shuai LIAO-LSL_8352

 

07 Ficus excavata Kinabalu Park●20190333★ Shuai LIAO-LSL_8353

08 Ficus excavata Kinabalu Park●20190333★Shuai LIAO-LSL_9176

03 Ficus excavata Kinabalu Park●20190333★ Shuai LIAO-LSL_8349