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hypothallus

[hahy-puh-thal-uh s, hip-uh-]
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noun, plural hy·po·thal·li [hahy-puh-thal-ahy, hip-uh-] /ˌhaɪ pəˈθæl aɪ, ˌhɪp ə-/.

a layer of hyphae rimming the thallus of certain lichens.
a filmlike residue at the base of the sporangia of certain slime molds.

Origin of hypothallus

From New Latin, dating back to 1850–55; see origin at hypo-, thallus
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for hypothallus

Historical Examples of hypothallus

  • The hypothallus is sometimes noticeable under some of the sporangia where closely crowded, but is not a constant feature.

    The North American Slime-Moulds

    Thomas H. (Thomas Huston) MacBride

  • In the centre of the fructification, next the hypothallus, the sporangia are very imperfectly differentiated.

    The North American Slime-Moulds

    Thomas H. (Thomas Huston) MacBride

  • The hypothallus is quite distinct, extra-marginal, and in substance like to the peridial wall.

    The North American Slime-Moulds

    Thomas H. (Thomas Huston) MacBride

  • Plasmodiocarp very much flattened, longitudinally creeping and reticulate or altogether widely effused; hypothallus none.