Thalli medium-brown of flat blades branching regularly into two’s (dichotomous), a narrow variety, var. intricata (C. Agardh) Greville, with relatively long distances between branching, is common in sheltered.

Original publication: Greville, R.K. (1830). Algae britannicae, or descriptions of the marine and other inarticulated plants of the British islands, belonging to the order Algae; with plates illustrative of the genera. pp. [i*-iii*], [i]-lxxxviii, [1]-218, pl. 1-19. Edinburgh & London: McLachlan & Stewart; Baldwin & Cradock.

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Norris, J.N. (2010). Marine algae of the Northern Gulf of California: Chlorophyta and Phaeophyceae. Smithsonian Contributions to Botany 94: i-x, 1-276.

Serio, D., Alongi, G., Catra, M., Cormaci, M. & Furnari, G. (2006). Changes in the benthic algal flora of Linosa Island (Straits of Sicily, Mediterranean Sea). Botanica Marina 49: 135-144.

Basionym: Zonaria dichotoma var. intricata C.Agardh

Type locality: Cádiz, Spain (Silva, Basson & Moe 1996: 590). Type: LD? (De Clerck 2003: 183).