sertularian

from WordNet (r) 3.0 (2006)

sertularian
    n 1: feathery colony of long-branched stems bearing stalkless
         paired polyps

from The Collaborative International Dictionary of English v.0.48

Sertularian \Ser`tu*la"ri*an\, n. (Zool.)
   Any species of Sertularia, or of {Sertularidae}, a family of
   hydroids having branched chitinous stems and simple sessile
   hydrothecae. Also used adjectively.
   [1913 Webster]