hypothallus

hy·po·thal·lus

[hahy-puh-thal-uhs, hip-uh-]
noun, plural hy·po·thal·li [-thal-ahy] .
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.

Origin:
1850–55; < Neo-Latin; see hypo-, thallus

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Hypothallus is always a great word to know.
So is ninnyhammer. Does it mean:
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
a fool or simpleton; ninny.
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