Description:
É mais pequeno que Gymnogongrus crenulatus, tem uma ramificação muito fina e as extremidades aguçadas.
Cartilaginous, cylindrical to compressed, brow-red to blackish purple fronds, to 75 mm high, from an expanded discoid base. Repeatedly dichotomous, fastigiate, with rounded, somewhat flattened apices. Generally with rounded excrescences (reproductive bodies known as tetrasporoblasts).

Habitat:
On sand-covered rocks, lower intertidal, rare, widely distributed.

Similar species:
Polyides rotundus from which it many be distinguished by the presence of a rhizoidal base, narrower branching angles (i.e. less fan-shaped), and that the fronds are brownish when held up to the light.

(In: Seaweed Site - ©Michael D. Guiry - http://seaweed.ucg.ie/descriptions/Gymgri.html)