Then the various blends of relative amounts of these 3 and chlorophyll, influences the plant colour, which can vary from dark red to blue, brown, or greenish.

[4] In 1996, Saunders and Kraft recognized a new name, the Halymeniales, for the red algal order that was previously known as the Cryptonemiales Kylin,[5] based on small-subunit rRNA phylogenetic analyses.

The adapted order of Halymeniales originally held the families of Halymeniaceae Bory and Sebdeniaceae Kylin, and it was characterized by taxa with a multi-axial thallus, non-procarpic female reproductive development, outwardly directed carpogonial branches and intercalary auxiliary cells (Saunders and Kraft, 1996).

[6] Later, Papenfuss (1955) synonymized the Grateloupiaceae with the Cryptonemiaceae; however, Guiry (1978) reinstated the Halymeniaceae Bory based on nomenclatural priority.

[18] Also, Halymenia durvillei is a red seaweed with a great potential as sulphated galactan producer.