Melanothamnus delicatulus (Hollenb.) Huisman, 2018 species homotypic synonym

Herposiphonia grandis species accepted

Herposiphonia verticillata species accepted

Herposiphonia delicatula Hollenb. species accepted

Herposiphonia dendroidea Hollenb., 1968 species accepted

Herposiphonia filifera Hollenberg, 1968 species accepted

Herposiphonia pecten-veneris (Harv.) Falkenb., 1901 species accepted

Herposiphonia subdisticha Okamura, 1899 species accepted

Herposiphonia littoralis species accepted

Herposiphonia clavata M.J.Wynne species accepted

Herposiphonia secunda (C.Agardh) Ambronn species accepted

Herposiphonia tenella f. secunda (C.Agardh) Hollenb., 1968 form synonym

Herposiphonia variabilis Hollenberg, 1968 species accepted

Herposiphonia nuda Hollenb. species accepted

Herposiphonia obscura Hollenb., 1968 species accepted

Herposiphonia pacifica Hollenb., 1968 species accepted

Herposiphonia parca Setch. species accepted

Herposiphonia terminalis Segi, 1954 species synonym

Herposiphonia fusca Jaasund, 1976 species synonym

Herposiphonia plumula species accepted

Herposiphonia hollenbergii species accepted

Herposiphonia bipinnata M.A.Howe species accepted

Polysiphonia pecten-veneris Harv., 1853 species synonym

Hutchinsia secunda C.Agardh species synonym

Polysiphonia secunda (C.Agardh) Zanardini, 1840 species synonym

Polysiphonia delicatula Hollenb., 1968 species synonym

Herposiphonia rigida species accepted

Herposiphonia parva species accepted

Herposiphonia ceratoclada (Mont.) Reinbold species accepted