Minium R.L. Moe, 1979 genus accepted

Faucheaceae I.M. Strachan, G.W. Saunders & G.T. Kraft family accepted

Fryeellaceae L. Le Gall, Dalen & G.W. Saunders, 2008 family accepted

Grammephora N'Yeurt & Payri, 2007 genus accepted

Champiaceae Kützing, 1843 family accepted

Hymenocladiaceae L. Le Gall, Dalen & G.W. Saunders, 2008 family accepted

Lomentariaceae J. Agardh, 1876 family accepted

Rhodymeniaceae Harvey, 1849 family accepted