soredium

noun
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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History and Etymology for soredium

New Latin, irregular from Greek sōros heap + New Latin -idium; akin to Latin tumēre to swell

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