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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Origin and Etymology of soredium
New Latin, irregular from Greek sōros heap + New Latin -idium; akin to Latin tumēre to swell — more at thumb
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