( Zonaria flava )

/ / Marine Flora

Description Zonaria flava has flattened, fan-shaped blades developed from a short row of marginal apical cells (1; 2); the blades are approximately eight cells thick and possess a dichotomous pattern with prominent red central nerves (1). The alga is up to 200mm in height and has a yellow-brown colouration (1). There are sixteen species within the genus Zonaria (3); the species most similar in appearance is the genus Padina. None of the species are listed under the IUCN Redlist (4).


Z. flava is located in shaded areas, on rocks, pools and caves to depths of 40m (1).

Life Cycle

The gametophytes and sporophytes are morphologically similar (1); unilocs, known as sori, occur irregularly across the thallus, and each produce eight non-flagellate spores (2).


Z. flava can be found within the Mediterranean, and north-east and north-west Atlantic (1).


Z. flava uses photosynthesis, as well as requiring various inorganic nutrients, such as carbon dioxide, phosphorus and fixed nitrogen (2).

Conservation Status

Not listed under the IUCN Redlist (4).


Description written by Ben Harvey (2009) (1)   Cabioc’H, J., Floc’H, J. & Le Toquin, A., 1992. Guide mes algues des mers d’Europe. Paris: Delachaux et Niestle. (2)   Graham, L.E. & Wilcox, L.W., 2000. Algae. New Jersey: Prentice-Hall Inc. (3)   Guiry, M.D. (2009). Zonaria. In: Guiry, M.D. & Guiry, G.M. (2009). AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. Accessed through the World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=144093 on 2009-09-02 (4)   IUCN, 2009. IUCN Red List of Threatened Species. [Online] (2009.1) Available at: www.iucnredlist.org [Accessed 01 September 2009].