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DescriptionForms elongated, very slender colonies with narrow "leaves" bearing polyps. Colour yellowish or whitish; capable of luminescence in darkness. Up to 600mm long with central stem only a few mm thick. All sea-pens possess an internal calcareous skeletal rod (axis): in this species it is round in section and often protrudes from the top of the colony. Only Funiculina quadrangularis is similar but its polyps are not arranged in "leaves" and its axis is square in section.