so·re·di·um
| \ səˈrēdēəm \
plural soredia\
-dēə
\
Definition of soredium
: one of the vegetative gemmae on the surface of the thallus of a lichen consisting of a tuft of hyphae investing a few algal cells or gonidia
— called also brood bud, hologonidium
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Merriam-Webster unabridged
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