''Gelidiella'' is a genus of red algae ( phylum Rhodophyta). Worldwide there are 22 species of ''Gelidiella'', mostly tropical and subtropical. ''Gelidiella'' and ''Gelidium'' are now both united into one order Gelidiales. ''Gelidiella acerosa'' has been used in the treatment of Alzheimer's disease.

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* Red algae genera Gelidiales {{Rhodophyta-stub