A large hydroid 10-15 cm in height with a solitary polyp. The polyp and tentacles have a diameter of about 1.5 cm. Stems are erect, clustered together and fuse with each other towards the base of the colony, which has a tough yellowish coloured natural outer layer. The polyps are conical or flask shaped and richly coloured with various shades of pink to red. The polyp looks flower-like and consists of a central circlet of about 40 oral tentacles surrounded by about 20-30 paler but larger aboral tentacles. Polyps are often present only in the spring and are eaten by nudibranchs leaving the stems.
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