lithothamnion

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lithothamnion (lith-o-tham'-ni-on). A plant of the genus Lithothamnion, an encrusting or nodular red calcareous alga of the family Corallinaceae, abundant in post-Jurassic rocks, and reported as a living form from considerable depths and very cold waters. It is most abundant on the seaward edge of reef flats, where it acts as a cementing medium of some coral reefs.

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