Caloglossa

Content sourced from Wikipedia, licensed under CC BY-SA 3.0.

Caloglossa is a genus of red algae in the Delesseriaceae family. Its thalli (the plant bodies) look like branching leaves, and this “exogenous primary branching” helps distinguish Caloglossa from many related algae (though Taenioma is a closely related exception). The thalli are red to brown and have a noticeable midrib made by a row of elongated cells.

Habitat and distribution
Caloglossa is found worldwide in shallow nearshore areas, from tropical to temperate waters. It can grow in waters with different salinities, on stones along marine coasts, in brackish estuaries, attached to saltmarsh and mangrove habitats, and even in freshwater regions.

Reproduction
In fresh water, Caloglossa populations spread by vegetative growth. In brackish water, they can reproduce sexually.

Uses
Caloglossa is popular in aquariums and aquascaping. Caloglossa cf. beccarii, in particular, is favored for its variety of colors and ease of cultivation. This species has also been explored as a potential food item in Thailand, where it showed low toxicity and potential nutritional benefits.

Taxonomy notes
There is some debate about who formally named the genus. Some sources attribute the name to Agardh, while others credit Martens. In 1994, King & Puttock argued that Martens did not formally elevate Caloglossa to genus status in his 1869 work, instead following Agardh’s later treatment. The genus’ classification has been refined using both morphology and DNA analysis.

Species count
As of 2024, AlgaeBase recognizes 22 species within Caloglossa.