Gelidiid

Gelidiid is a family of red algae within the order Gelidiales. These algae are commonly known as agarophytes due to their high agar content, making them commercially important. Gelidiid species are found in marine environments worldwide, typically inhabiting rocky substrates in intertidal and subtidal zones. They are characterized by their cartilaginous, often branched thalli, which can vary in color from light red to dark brown. The reproductive structures of Gelidiids are sori, which are small, raised areas containing spores.

The economic significance of Gelidiid algae lies primarily in the production of agar. Agar is a gelatinous substance extracted from the cell walls of these red algae. It is widely used as a gelling agent, thickener, and stabilizer in various industries, including food manufacturing, microbiology as a growth medium for bacteria, and pharmaceuticals. Different species of Gelidiid produce agar with varying properties, influencing their suitability for specific applications. Research continues to explore the potential of Gelidiid species for other uses, such as sources of bioactive compounds with potential pharmaceutical benefits. Identification of Gelidiid species often relies on morphological characteristics and molecular data.