Austrolithon A.S. Harvey & Woelkerling, 1995 genus accepted

Boreolithon A.S. Harvey & W.J. Woelkerling, 1995 genus accepted

Callilithophytum P.W. Gabrielson, W.H. Adey, G.P. Johnson & J.J. Hernandez-Kantun in Adey, Hernandez-Kantun, Johnson & Gabrielson, 2015 genus accepted

Choreonema F.Schmitz, 1889 genus accepted

Melobesia J.V.F. Lamouroux, 1812 genus accepted

Exilicrusta Chamberlain, 1992 genus accepted

Phymatolithon Foslie, 1898 genus accepted

Lithothamnion Heydrich, 1897 genus accepted

Epulo R.A. Townsend & J. M Huisman, 2004 genus accepted

Mastophoropsis Woelkerling, 1978 genus accepted

Crustaphytum L.-C. Liu & S.-M. Lin in Liu et al., 2018 genus accepted

Synarthrophyton R.A. Townsend, 1979 genus accepted

Sphaeranthera Heydrich, 1900 genus provisionally accepted