soredium

noun

so·​re·​di·​um

səˈrēdēəm

plural soredia

-dēə

: 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

Word History

Etymology

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

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