Halymenia durvelliaei Bory de Saint Vincent
This species often grows on rocks in subtidal zone. It is a very good source of carrageenan. The local carrageenan called gulaman came from this species. It is also a source of food coloring.
Thallus flat up to 17 cm high attached by discoid holdfast; initial branching palmate, secondary branching irregularly alternate, each successive order of branching smaller, final branchlets acute. Dark red in color, texture very mucilaginous.