Tree 10-15 m. Leaves chartaceous or thinly coriaceous, oblong or (ob)lanceolate, 20-35 by 7-12 cm, base rounded or short-attenuate, apex acute-acuminate; Inflorescences between the leaves or below, of the Knema-type: Fruits solitary, subsessile, (broadly) ellipsoid (immature fruit subglobose in Kostermans 1039), 5.5-8.5 by 4-5 cm, base rounded or ± attenuate, hairs cinnamon, scurfy, 0.1-0.2 mm;
Asia-Tropical: Maluku (Maluku present), Bacan present, Halmahera present, Morotai present
Malesia: Moluccas (Morotai, Halmahera, Bacan).
May be confused with M.fatua which has smaller fruits with thinner pericarp, and longer hairs, 0.5-1 mm long; the pericarp of M.fatua subsp. ajfinis (Sulawesi) has also a thick pericarp but differs in the much more conspicuous indumentum; male flowers of subsp. fatua generally are smaller and those of subsp. affinis lack a sterile apex on the synandrium.