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From The Collaborative International Dictionary of English v.0.48:
Umbellularia \Um*bel`lu*la"ri*a\, prop. n. [NL. See Umbellule.] (Zool.) A genus of deep-sea alcyonaria consisting of a cluster of large flowerlike polyps situated at the summit of a long, slender stem which stands upright in the mud, supported by a bulbous base. [1913 Webster]