Description: Thallus flat, branches dichotomously three times or more to a length of over 5 cms. The flat fronds spread, branches with pointed apices which taper and reattach to the substrate.

Habitat: Rare. Sublittoral to 40 m.

Distribution: Around the coasts of the British Isles: England south-west coast, Wales, occasional records from Scotland and around most of Ireland except the east coast from Co.Louth and Wicklow. Europe: Mediterranean,

Key Identification Features:

• Fan shaped thallus with pointed tips.

Distribution Map from NBN: Rhodymenia ardissonei at National Biodiversity Network mapping facility, data for UK.

iNaturalist: Rhodymenia ardissonei at iNaturalist World Species Observations database.

WoRMS: Rhodymenia ardissonei at World Register of Marine Species. Accepted name: Rhodymenia ardissonei (Kuntze) Feldmann, 1937. AphiaID: 145850.

Classification: Biota; Plantae; Biliphyta; Rhodophyta; Eurhodophytina; Florideophyceae; Rhodymeniophycidae; Rhodymeniales; Rhodymeniaceae; Rhodymenia