Ceramium ciliatum is a small marine red alga in the Division Rhodophyta.

It is basically monosiphonous and composed of large cylindrical cells.

Small periaxial cells are formed at the nodes, these produce cortical filaments which form bands around the central cells.

Spines of three cells occur clearly delimited from the cortical bands.

[2] Growing on rock, shells and other algae to a depth of 26 m.[1] To be found around Ireland, Britain, The Isle of Man, Norway and France and Mediterranean.