Castanopsis acuminatissima is an evergreen tree native to Southeast Asia and New Guinea. It is known by a variety of common names over its range, including white oak, New Guinea oak, Papua New Guinea oak, ki riung, ko-duai, ko-soi, ko-mat, meranak, and riung anak.
Castanopsis acuminatissima is a large canopy tree, up to 40 meters in height. The trunk is markedly fluted, and sometimes buttressed. The bark is grey or pale brown, rough and fissured, less than 25 mm thick, with red under-bark.
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