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isidium

A Dictionary of Biology | 2004 | 259 words | Copyright

isidium (pl. isidia) An outgrowth from the thallus of a lichen, 0.01–0.03 mm in diameter, that includes both algal and fungal cells. Isidia can detach from the main body of the lichen and serve as structures of vegetative propagation. Compare soredium.

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