Prostrate dioecious mat-forming terrestrial or aquatic herb 2–10 cm tall. Leaves alternate, linear, entire; lamina 2.5–5 mm long. Bracteoles of male flowers linear, 0.8–0.9 mm long; of female flowers ovate to lanceolate, 0.4–0.5 mm long. Flowers 4-merous, solitary. Male flowers: pedicels 0.6–0.7 mm long; sepals absent; petals 1.8–2.5 mm long; stamens 8. Female flowers sessile; sepals and petals absent; ovary 4-locular; stigmas sessile, white. Fruit sessile, cubiform, red-purple; mericarps cylindrical, 0.8–0.9 mm long, slightly obliquely truncate, strongly papillose in 3–5 irregular rows.
The "tank gilgai" or ephemeral wetlands of the Pilliga outwash, New South Wales, that provide habitat for M. implicatum are described by Benson et al. (2010) and Bell et al. (2012).
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