What is "desmarestiales"

'''Desmarestiales ''' is an order in the brown algae (class Phaeophyceae). Member of this order have terete or ligulate (flat) pinnately branched thalli attached by discoid holdfasts. They have a sporphytic thallus usually aggregated to form a pseudo parenchyma. The genus Desmarestia is named after the French zoologist Anselme-Gaétan Desmarest (1784 - 1838).

As their general name of the class suggests their pigmentation is brown.