Polyosma alangiacea, commonly known as white alder, is a tree in the family Escalloniaceae which is endemic to northeast Queensland. It was first described in 1872.
The natural range of this species is the sub-coastal ranges of northeast Queensland from near Cooktown south to the area around Eungella, west of Mackay. It grows in well developed rainforest at altitudes from, on volcanic soils (derived from basalt or granite).
The white alder has been given the status of least concern by Queensland's Department of Environment, Science and Innovation., it has not been assessed by the International Union for Conservation of Nature (IUCN).