Desmarestiales

Desmarestiales is an order in the brown algae (Phaeophyceae). Members of this order have terete or ligulate (flat) pinnately branched thalli attached by discoid holdfasts. They have a sporophytic thallus usually aggregated to form a pseudo-parenchyma.^[1] The order gets its name from the genus Desmarestia, which is named after the French zoologist Anselme Gaëtan Desmarest (1784–1838).^[2][3]

Desmarestiales
Desmarestia aculeata
Scientific classification
Domain:	Eukaryota
Clade:	Sar
Clade:	Stramenopiles
Phylum:	Ochrophyta
Class:	Phaeophyceae
Subclass:	Fucophycidae
Order:	Desmarestiales Setchell & Gardner
Families
Arthrocladiaceae Desmarestiaceae

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