This seaweed has bluish or yellow fronds with blue iridescence. The fronds are flexible and cartilaginous in texture, turning black when dry. Young axes show a striking turquoise iridescence when alive. The thallus consists of cylindrical erect axes or trailing tufts, and is 3-8 cm high when erect. The distinct main axis is 0.4-0.5 mm in diameter, branching sparsely at irregular intervals in a spiral pattern to 1-3 orders of branching.

Cited from: Leonel Pereira: Pereira, L. (2010) "Litoral de Viana do Castelo: ALGAS", 1ª edição, Câmara Municipal de Viana do Castelo.