Source : Webster's Revised Unabridged Dictionary (1913)

Sertularia \Ser`tu*la"ri*a\, n. [NL., dim. fr. L. serta a
   garland.] (Zo["o]l.)
   A genus of delicate branching hydroids having small sessile
   hydrothec[ae] along the sides of the branches.

Source : WordNet®

Sertularia
     n : sessile hydroid that forms feathery colonies [syn: {genus
         Sertularia}]