Meaning of hypothallus

hy•po•thal•lus

Pronunciation: (hī"pu-thal'us, hip"u-), [key]
— pl. -thal•li
  1. a layer of hyphae rimming the thallus of certain lichens.
  2. a filmlike residue at the base of the sporangia of certain slime molds.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.