A genus of red algae commonly found in cold marine waters, valued commercially for producing agar used in cooking and scientific laboratories.
Modern Latin genus name derived from Latin gelidus (cold), named because these algae are found in cold waters; the suffix -ium is standard in Latin scientific nomenclature.
Gelidium algae produce agar, the gel that microbiologists use to grow bacteria in petri dishes—so when scientists hunt for new bacteria, they're literally using a cold-water plant to do it!
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