Alcyonidium condylocinereum Porter, 2004 (basis of record)
Alcyonidium condylocinereum Porter, 2004 (original description)
Alcyonidium gelatinosum var. lacourti d'Hondt, 1983 accepted as Alcyonidium diaphanum (Hudson, 1778) (basis of record)
Alcyonidium gelatinosum var. lacourti d'Hondt, 1983 accepted as Alcyonidium diaphanum (Hudson, 1778) (source of synonymy)
Alcyonidium hydrocoalitum Porter, 2004 (basis of record)
Alcyonidium hydrocoalitum Porter, 2004 (original description)
Alcyonidium proliferans Lacourt, 1949 accepted as Alcyonidium diaphanum (Hudson, 1778) (source of synonymy)
Alcyonidium topsenti Roehrich, 1910 accepted as Alcyonidium diaphanum (Hudson, 1778) (basis of record)
Alcyonidium topsenti Roehrich, 1910 accepted as Alcyonidium diaphanum (Hudson, 1778) (source of synonymy)
Fucus gelatinosus Desfontaines, 1799 accepted as Laurencia obtusa var. gracilis (C.Agardh) Zanardini, 1847 (basis of record)
Fucus gelatinosus Desfontaines, 1799 accepted as Laurencia obtusa var. gracilis (C.Agardh) Zanardini, 1847 (source of synonymy)
Ulva diaphana Hudson, 1778 (basis of record)
Ulva diaphana Hudson, 1778 (source of synonymy)

Bristol Channel for Alcyonidium condylocinereum Porter, 2004 
English Channel for Alcyonidium condylocinereum Porter, 2004 
Irish Exclusive economic Zone for Alcyonidium condylocinereum Porter, 2004 
Wales for Alcyonidium hydrocoalitum Porter, 2004 

Holotype BMNH 1984.2.26.12, geounit Oxwich Bay, identified as Alcyonidium hydrocoalitum Porter, 2004
Holotype BMNH 2002.2.1.3, geounit Dover Strait, identified as Alcyonidium condylocinereum Porter, 2004

 Type specimen

 for Alcyonidium condylocinereum Porter, 2004

Types are deposited at the BMNH. Type locality Dover Strait, English Channel [details]

 Type specimen

 for Alcyonidium hydrocoalitum Porter, 2004

Type specimens are deposited at BMHN. Type locality is Oxwich Bay, Gower Peninsula, South Wales [details]