Pennantia cunninghamii, known as brown beech,[2] is a species of flowering plant in the family Pennantiaceae and is endemic to eastern Australia.

It is a tree with a fluted trunk, elliptic or oblong leaves and white, either bisexual or male flowers.

Pennantia cunninghamii is a tree that typically grows to a height of up to 30 m (98 ft) and has an irregularly fluted trunk with dark grey to brown, often scaly bark and a flanged base.

[2][3][4][5] Pennantia cunninghamii was first formally described in 1852 by John Miers in The Annals and Magazine of Natural History from specimens collected by Allan Cunningham in the Illawarra region.

[4] Brown beech grows in rainforest from Clyde Mountain near Batemans Bay (35° S) in southern New South Wales to Atherton (17° S) in tropical Queensland.