exciple
noun
ex·ci·ple
ˈeksəpəl
variants
or less commonly excipule
-ˌpyül
plural -s
: a saucer-shaped rim around the hymenium of various lichens formed (1) from the hypothecium or (2) from the upper layer of the thallus
called also respectively 1proper exciple, 2thalloid exciple
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Merriam-Webster unabridged
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