Shrub or tree 3-10 m. Twigs subterete or somewhat flattened, (4-)5-10 mm diameter, with distinct, raised lines or narrow wings l(-2) mm high, joining the petioles, glabrescent, hairs 0.1-0.2 mm, hollow, and with ant-swellings similar to those in M. subalulata; older twigs sometimes with conspicuous lenticels. Leaves membranous or chartaceous, obovate-elliptic or oblong, 22-35 by 7-16 cm, base short-cuneate, rounded, or shallowly cordate, apex (acute-)acuminate; upper surface olivaceous, lower surface greyish (green), glabrous or glabrescent, hairs scale-like, 0.1 mm or less, lower surface either ± papillose (subsp. fissiflora) or not (subsp. kostermansii); dots absent; midrib flat or slightly raised above, lateral nerves 18-23 per side, at 45-80° to the midrib, flat or sunken above, lines of interarching and venation distinct; petiole 15-25 by 2-4 mm; leaf bud 15 by 4 mm, hairs 0.1 mm. Inflorescences between the leaves, of the Knema-typc, a (sub)sessile scar-covered brachyblast, minutely pubescent; in male: to 10 mm long, 4-6 mm wide, subumbel of 2-8 flowers, buds of various sizes; bracts minute, caducous; flowers with sparse or dense dark brown hairs 0.1-0.2 mm. Male flowers: pedicel distinct, bracteole large or small, caducous; buds ± broadly fusiform or obovate-oblong, 8-12 mm long, cleft to over 1/2; see further under the subspecies. Female flowers and fruits not known with certainty, see note.
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