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Order Dictyotales

Family Dictyotaceae

Zonaria C. Agardh

Plants erect, fan-shaped or much branched, parenchymatous, attached by matted rhizoidal holdfast. Growth by row of marginal apical cells. Thallus in cross-section with two cortical cells overlying each outer medullary cell.  Sporangia clavate/ovoid, lacking a stalk cell, borne externally in sori. Eight spores produced per sporangium. Thirteen species are currently recognized worldwide (M.D. Guiry in Guiry & Guiry 2014), of which two are found on the south coast.

Key to species

1a. Blades linear strap-shaped, ca. 200-300 μm and at least 10 cells thick near centre

Zonaria subarticulata

1b. Blades rather fan-shaped, ca. 100 μm and 6 cells thick near centre

Zonaria tournefortii

References Zonaria

M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2014. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 11 September 2014.

 

Cite this record as:

Anderson RJ, Stegenga H, Bolton JJ. 2016. Seaweeds of the South African South Coast.
World Wide Web electronic publication, University of Cape Town, http://southafrseaweeds.uct.ac.za; Accessed on 18 December 2018.