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Order Ceramiales

Family Callithamniaceaae

Crouania J. Agardh

Plants filamentous, irregularly branched, either monopodial or sympodial. Cells of the central axis each with a verticel of three whorl branchlets: axis with or without rhizoidal cortication. Tetrasporangia borne on the proximal cells of the whorl branchlets; spermatangia formed on apical cells of the whorl branchlets; procarps formed near the thallus apices, in the place of a whorl branchlet; carposporophytes with several gonimolobes, without special involucral filaments, but enclosed in whorl branchlets. Seventeen species are currently recognised (Guiry & Guiry 2015), of which two are found on the south coast.

Key to the species

1a. Verticils embedded in mucilage sheaths, the external cells of successive whorls forming an almost continuous layer

Crouania francescoi

1b. Verticils without obvious mucilage sheaths, the successive whorls clearly separate

Crouania attenuata

 

References Crouania

Guiry, M.D. & Guiry, G.M. 2015. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 26 November 2015.

 

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 September 2018.