Entwisleiales F.J. Scott, G.W. Saunders & G.T. Kraft, 2013 order accepted

Gelidiales Kylin order accepted

Gigartinales F. Schmitz order accepted

Halymeniales G.W. Saunders & Kraft order accepted

Hildenbrandiales Pueschel & Cole order accepted

Herpophyllum J.Agardh, 1894 genus accepted

Nemastomatales Kylin order accepted

Batrachospermales Pueschel & K.M. Cole order accepted

Bonnemaisoniales Feldmann & Feldmann order accepted

Ceramiales Oltmanns order accepted

Gracilariales S. Fredericq & M.H. Hommersand, 1989 order accepted

Ahnfeltiales C.A. Maggs & C.M. Pueschel order accepted

Balliales H.-G. Choi, G.T. Kraft & G.W. Saunders order accepted

Plocamiales G.W. Saunders & G.T. Kraft order accepted

Nemaliales F. Schmitz order accepted

Lobocolax M.A. Howe, 1914 genus provisionally accepted

Palmariales Guiry & D.E.G. Irvine order accepted

Peyssonneliales D.M. Krayesky, Fredericq & J.N. Norris order accepted

Pihiellales J.M. Huisman, A.R. Sherwood & I.A. Abbott order accepted

Rhodachlyales G.W. Saunders, S.L. Clayden, J.L. Scott, K.A. West, U. Karsten & J.A. West order accepted

Rhodogorgonales S. Fredericq, J.N. Norris & C. Pueschel order accepted

Rhodymeniales F. Schmitz order accepted

Sebdeniales R.D. Withall & G.W. Saunders order accepted

Sporolithales Le Gall, Payri, Bittner & G.W. Saunders order accepted

Donezella V.P. Maslov, 1929 genus accepted

Thoreales K.M. Müller, A.R. Sherwood, C.M. Pueschel, R.R. Gutell & R.G. Sheath order accepted

Enigma Weber-van Bosse, 1932 genus provisionally accepted

Entocolax P.F. Reinsch, 1875 genus accepted

Masloviporidium J.R. Groves & B.L. Mamet in D.F. Toomey & M.H. Nitecki, 1985 genus accepted

Eurysolenopora W.O. Dietrich, 1930 genus accepted

Atractophorales C.A. Maggs, L. Le Gall, G. Filloramo & G.W. Saunders in Saunders et al., 2016 order accepted

Hapalidiales W.A. Nelson, J.E. Sutherland, T.J. Farr & H.S. Yoon in Nelson et al., 2015 order accepted

Corynodactylales G.W. Saunders, K.L. Wadland, E.D. Salomaki & C.E. Lane, 2017 order accepted

Corallinapetra T.J. Farr, W.A. Nelson & J.E. Sutherland in Nelson et al., 2015 genus accepted

Catenellopsidales K.R. Dixon, G. Filloramo & G.W. Saunders in Saunders et al., 2016 order accepted

Acrochaetiales Feldmann order accepted

Acrosymphytales R.D. Withall & G.W. Saunders order accepted

Balbianiales R.G. Sheath & K.M. Müller order accepted

Colaconematales J.T. Harper & G.W. Saunders order accepted

Corallinales P.C. Silva & H.W. Johansen order accepted