Phyllospadix serrulatus is a species of aquatic plant in the Zosteraceae family.

[2] It is referred to by the common name toothed surfgrass,[3] and is found along the shorelines of British Columbia and southern Alaska.

It is also found in Oregon.

[4] It grows in salt marshes in the intertidal zone.

[5] Phyllospadix serrulatus is a grass-like herb with leaves up to 60 cm long, with teeth along the margins toward the tip.