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Definition of: soredium
(sə·rē′dē·əm) noun plural ·di·a (-dē·ə) Bot.
A scalelike structure of algal cells in a lichen, enveloped in a network of hyphae and capable of independent vegetative growth. Also so·rede (sō′rēd). [<NL <Gk. sōros a heap]
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