Rhodymenia holmesii Ardissone

Rhodymenia holmesii

Description: Thallus erect growing from stoloniferous holdfast with a short stipe expanding into a fan-shaped flattened blade with parallel sides less than 4 mm wide.The blade divides dichotomously 4 or 5 times to a height of 8 cms. The apices sometimes are elongated into proliferations up to 2 cms long.

Habitat: Uncommon. Epilithic generally in the sublittoral to 30m depth.

Distribution: Most common on the southern coasts of the British Isles. Scattered sites around Ireland, west Ireland, Wales, west Scotland and England on the south coast, Kent and Norfolk, occasional elsewhere. Europe: Spain and France. Further afield: Canary Islands and South Africa.

Similar Species: Rhodymenia pseudopalmata has wider blades of 5-10 mm.

Distribution Map: NBN map : National Biodiversity Network mapping facility, data for UK.

WoRMS: Species record : World Register of Marine Species.

 Morton, O. & Picton, B.E. (2016). Rhodymenia holmesii Ardissone. [In] Encyclopedia of Marine Life of Britain and Ireland.
http://www.habitas.org.uk/marinelife/species.asp?item=ZM7260 Accessed on 2021-12-04

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