noun, plural isidia [ahy-sid-ee-uh] . Botany.
a coralloid outgrowth from the thallus in certain lichens.

1865–70; < Neo-Latin, derivative of Isid- (stem of Isis) Isis (from the hornlike appearance of the growth); see -ium Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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For reproduction, lichen possess isidia, soredia, and undergo simple fragmentation.
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