Caulerpa sertularioides, also known as green feather algae,[1][2] is a species of seaweed in the Caulerpaceae family found in warm water environments.

Stolons are branched out to slim points and rhizoids then form from bottom surface[1] these fork and penetrate the sandy substrate firmly anchoring the seaweed to the seafloor.

[2] The species was first formally described by the botanist and taxonomist Marshall Avery Howe in 1905 as part of the work Phycological studies - II.

It is also found throughout the Caribbean around Bermuda, Bahamas, Greater and Lesser Antilles and in the Gulf of Mexico and in the southern Atlantic Ocean to Brazil (Taylor 1979).

[3] The species is usually part of coastal and estuarine environments where it grows in sandy areas, as seagrass beds or on and around mangrove roots.