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.

[2][3] As the general name of the class suggests, their pigmentation is brown.

Yang, Eun; Peters, Akira; Kawai, Hiroshi (January 2014).

"Ligulate Desmarestia (Desmarestiales, Phaeophyceae) revisited: D. japonica sp.