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Order Ceramiales

Family Ceramiaceae

Antithamnion Nägeli

Plants, filamentous, ecorticate, differentiated into long indeterminate axes and short determinate “whorl branchlets”, the latter in opposite pairs on each main axial cell, whorl branchlets in successive segments distichous or decussate. Gland cells often present, borne by special three- or four-celled ramuli. Carpogonial filaments borne on the basal cell of otherwise little-modified whorl branchlets. About 50 species currently recognised (Guiry & Guiry 2015), of which two are recorded on the South African south coast.

Key to the species

1a. Species with gland cells; determinate ramuli branched alternately below the top

Antithamnion diminuatum

1b. Species without gland cells; determinate ramuli branched only adaxially below the top

Antithamnion hubbsii

References Antithamnion

Guiry, M.D. & Guiry, G.M. 2015. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway.; searched on 15 September 2015.

Stegenga, H., Bolton, J.J. and R. J. Anderson. 1997. Seaweeds of the South African west coast. Contributions from the Bolus Herbarium 18: 655 pp.


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,; Accessed on 02 March 2024.