Tree 20-40 m. Leaves thinly chartaceous, elliptic- or obovate-oblong, 15-21 by 4.5-10 cm, base cuneate, rounded, or subcordate, apex acute-acuminate; Inflorescences (from infructes-cences) of the Knema-type: Male and female flowers not known. Fruits: subsessile, single or 2-4 in a cluster, acorn-shaped, about as broad as long or broader than long, ± broadly ovoid, 1.3-2.3 by 1.8-2.7 cm, apex (broadly) rounded with short pointed tip, base broadly truncate, flat, or depressed, hairs dark (yellow-)brown, floccose, 0.5-1 mm long;
Asia-Tropical, Milne Bay Prov endemic, Northern Prov endemic, Papua New Guinea present
Malesia: Papua New Guinea (endemic to Northern Prov. and Milne Bay Prov.).
Known only from fruiting specimens. The indumentum of the lower leaf surface with long, emergent hairs, rather than only a thin felt-like covering, makes the species quite distinguishable from the M. fatua-species group, even in the sterile state.