• Cystoseira barbata (Stackhouse) C.Agardh, 1820 accepted as Treptacantha barbata (Stackhouse) Orellana & Sansón, 2019
• Cystoseira barbata f. aurantia (Kützing) Giaccone, 1985
• Cystoseira barbata f. crinoides Filarszky (uncertain)
• Cystoseira barbata f. flaccida (Kützing) Woronichin
• Cystoseira barbata f. hoppii (C.Agardh) Woronichin, 1908 accepted as Cystoseira barbata (Stackhouse) C.Agardh, 1820 accepted as Treptacantha barbata (Stackhouse) Orellana & Sansón, 2019
• Cystoseira barbata f. insularum Ercegovic, 1952
• Cystoseira barbata f. macrocarpa Schiffner (uncertain)
• Cystoseira barbata f. punctata Ercegovic, 1952
• Cystoseira barbata f. repens A.D.Zinova & Kalugina, 1974 accepted as Cystoseira barbata f. aurantia (Kützing) Giaccone, 1985
• Cystoseira barbata f. stenocarpa Schiffner (uncertain)
• Cystoseira barbata subsp. tophuloidea Ercegovic, 1952 accepted as Cystoseira barbata var. tophuloidea (Ercegovic) Giaccone, 1973 accepted as Cystoseira barbata var. tophuloidea (Ercegovic) Giaccone, 1986
• Cystoseira barbata var. concatenata Kützing (uncertain)
• Cystoseira barbata var. flaccida (Kützing) Woronichin, 1908
• Cystoseira barbata var. hoppii (C.Agardh) J.Agardh, 1842 accepted as Cystoseira barbata (Stackhouse) C.Agardh, 1820 accepted as Treptacantha barbata (Stackhouse) Orellana & Sansón, 2019
• Cystoseira barbata var. pumila Montagne, 1841 accepted as Cystoseira humilis Schousboe ex Kützing, 1860
• Cystoseira barbata var. tophuloidea (Ercegovic) Giaccone, 1973 accepted as Cystoseira barbata var. tophuloidea (Ercegovic) Giaccone, 1986
• Cystoseira barbata var. tophuloidea (Ercegovic) Giaccone, 1986
• Cystoseira barbata var. turneri J.Agardh (uncertain)
• Cystoseira barbata var. verrucosa Kützing (uncertain)