Herposiphonia insidiosa (Greville ex J.Agardh) Falkenberg, 1901 species synonym

Fernandosiphonia ecorticata R.E.Norris, 1994 species synonym

Lophosiphonia sparsa Setch., 1926 species synonym

Melanothamnus gorgoniae (Harvey) Díaz-Tapia & Maggs species accepted

Melanothamnus sphaerocarpus (Børgesen) Díaz-Tapia & Maggs, 2017 species accepted

Melanothamnus collabens (C.Agardh) Díaz-Tapia & Maggs, 2017 species accepted

Melanothamnus ferulaceus (Suhr ex J.Agardh) Díaz-Tapia & Maggs species accepted

Melanothamnus japonicus (Harv.) Diaz-Tapia & Maggs species accepted

Melanothamnus hawaiiensis (Hollenb.) Díaz-Tapia & Maggs, 2017 species accepted

Neosiphonia polyphysa (Kütz.) Skelton & G.R.South, 2007 species synonym

Polysiphonia japonica var. savatieri (Hariot) H.Y.Yoon, 1986 variety synonym

Polysiphonia insidiosa (J.Agardh) P.L.Crouan & H.M.Crouan species synonym

Neosiphonia flavimarina M.-S.Kim & I.K.Lee, 1999 species synonym

Polysiphonia argentinica W.R.Taylor, 1939 species synonym

Polysiphonia havanensis var. insidiosa J.Agardh, 1863 variety synonym

Polysiphonia nova-angliae W.R.Taylor species synonym

Polysiphonia harveyi J.W.Bailey species homotypic synonym

Neosiphonia sparsa (Setch.) I.A.Abbott, 2002 species synonym

Neosiphonia sphaerocarpa (Børgesen) M.S.Kim & I.K.Lee species homotypic synonym

Polysiphonia sphaerocarpa Børgesen species homotypic synonym

Neosiphonia savatieri (Har.) M.S.Kim & I.K.Lee, 1999 species synonym

Polysiphonia aggregata species synonym

Neosiphonia japonica (Harvey) M.S.Kim & I.K.Lee, 1999 species homotypic synonym

Polysiphonia nipponica Segi, 1951 species synonym

Polysiphonia japonica Harvey, 1857 species synonym

Polysiphonia akkeshiensis Segi, 1951 species synonym

Polysiphonia grateloupeoides Noda, 1970 species synonym

Polysiphonia siretokensis Yamada & Tanaka, 1944 species synonym

Neosiphonia apiculata (Hollenb.) Masuda & Kogame, 2003 species synonym

Polysiphonia apiculata Hollenb., 1968 species synonym

Polysiphonia hawaiiensis Hollenberg, 1968 species synonym

Polysiphonia sparsa (Setch.) Hollenb., 1968 species synonym

Streblocladia collabens (C.Agardh) Falkenb., 1901 species synonym

Hutchinsia collabens C.Agardh species synonym

Polysiphonia collabens (C.Agardh) Kütz. species synonym

Polysiphonia sericea Hauck, 1877 species synonym

Polysiphonia polyphysa Kütz., 1863 species synonym

Neosiphonia hawaiiensis (Hollenb.) M.-S.Kim & I.A.Abbott, 2006 species synonym

Neosiphonia upolensis (Grunow) M.S.Kim & Boo, 2008 species synonym

Vertebrata ferulacea (Suhr ex J.Agardh) Kuntze, 1891 species synonym

Melanothamnus ecorticatus (R.E.Norris) Díaz-Tapia & Maggs, 2017 species accepted

Melanothamnus hancockii (E.Y.Dawson) Diaz-Tapia & Maggs species accepted

Melanothamnus sparsus (Setch.) Díaz-Tapia & Maggs, 2017 species accepted

Melanothamnus savatieri (Hariot) Díaz-Tapia & Maggs, 2017 species accepted

Melanothamnus polyphysus (Kütz.) Díaz-Tapia & Maggs, 2017 species accepted

Melanothamnus flavimarinus (M.-S.Kim & I.K.Lee) Díaz-Tapia & Maggs, 2017 species accepted

Melanothamnus spec (Bailey) Díaz-Tapia species accepted

Melanothamnus upolensis (Grunow) Díaz-Tapia & Maggs, 2017 species accepted

Melanothamnus strictissimus (Hook.f. & Harv.) Diaz-Tapia & Maggs species accepted

Melanothamnus apiculatus (Hollenb.) Diaz-Tapia & Maggs species accepted

Neosiphonia collabens (C.Agardh) Díaz-Tapia & Bárbara, 2013 species synonym

Neosiphonia harveyi (J.W.Bailey) M.S.Kim et al. species homotypic synonym

Melanothamnus harveyi (Bailey) Diaz-Tapia & Maggs species accepted