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I agree, but it is slightly untypical, being much slimmer and with elongated main stems. That it is mostly skeleton helps. But could it possibly be Ellisolandia elongata?
Previously, on MaRLIN , Corallina officinalis was distinguished from the similar Corallina elongata by the structure of its reproductive bodies which bear horns or antennae.
*Hind & Saunders, 2013, determined that 'traditional reliance on conceptacle position as an indicator of generic affinities in the Corallineae is not supported and taxonomic changes are required'.
So, Corallina elongata is now Ellisolandia elongata http://www.marinespecies.org/aphia.php?p=taxdetails&id=732248
Hind & Saunders found that 'Corallina elongata was divergent from all other members of Corallina and is transferred to a new genus, Ellisolandia (E. elongata (J. Ellis & Solander) comb. nov).' Unfortunately for most of us 'iSpot mariners' they say that 'there are currently no morphological characters to distinguish the genus Ellisolandia from Corallina. To the best of our knowledge this is the first instance where a new algal genus has been described based solely on molecular phylogenetic analyses'.
So, while this looks more like what we formerly recognised as C. elongata than C. officinalis, we can only be sure it is in the taxonomic group Corallineae, a tribe (sub group) of the family Corallinaceae.
*Ref Hind & Saunders. J. Phycol. 49, 103–114 (2013). © 2012 Phycological Society of America DOI: 10.1111/jpy.12019
A MOLECULAR PHYLOGENETIC STUDY OF THE TRIBE CORALLINEAE (CORALLINALES, RHODOPHYTA) WITH AN ASSESSMENT OF GENUS-LEVEL TAXONOMIC FEATURES AND DESCRIPTIONS OF NOVEL GENERA1
Lat/Lng: 51.3929, 1.3997
OS grid ref: TR366714