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DescriptionA colonial hydroid with slender, upright stems that are closely spaced along branching stolons attached to the substratum. They are white to yellowish, typically 3-6 cm, and may be up to 10 cm in height. Branching is pinnate with short, stiff side branches that bear polyps at equal intervals on their inner side in chitinous cups (hydrothecae). The tiny gonothecae are pear-shaped and usually attached to the main stem.