Percursaria percursa is a species of seaweed from a family of Ulvaceae. The species' type locality is Denmark. Its floating masses of unbranched filaments are several centimeters in length, 24–32 micrometres (0.00094–0.00126 in) broad and 14–18 micrometres (0.00055–0.00071 in) thick.
Clade: Green Algae
Species: Percursaria percursa