''Percursaria percursa'' is a species of seaweed from the family

Ulvaceae Ulvaceae () is a widely distributed family of thin green algae having either a flat or a hollow tubular thallus, reproducing by the conjugation of planogametes or of zoospores, and being classed among the Ulotrichales or now more commonly placed ...

. The species type locality is

Denmark ) , song = ( en, "King Christian stood by the lofty mast") , song_type = National and royal anthem , image_map = EU-Denmark.svg , map_caption = , subdivision_type = Sovereign state , subdivision_name = Kingdom of Denmark , establish ...

. Its floating masses of unbranched filaments are several centimeters in length, broad and thick.

References

Ulvaceae {{Ulvophyceae-stub