Electronic Flora of South Australia Family Fact Sheet

ORDER SIPHONOCLADALES (Blackman & Tansley) Oltmanns

Phylum Chlorophyta

Thallus globular, expanded and membranous, or filamentous or clavate, simple or branched, formed of few to many large multinucleate cells which develop by segregative division, with the new segments expanding endogenously or exogenously. Chloroplasts reticulate, without pyrenoids.

Life history probably diplohaplontic, the sporophyte producing quadriflagellate zoospores and the gametophyte(s) biflagellate gametes where known.

Taxonomic notes: Many authors include the Siphonocladales within the Cladophorales, and in this account the Anadyomenaceae is placed under the latter order rather than under the Siphonocladales, where it is retained by Bold & Wynne (1978, p. 214). The genera of the Anadyomenaceae do not appear to show segregative division but new cells are formed by ingrowth of cross walls from the periphery. The order Siphonocladales is retained here for the single southern Australian genus which does show segregative division, on the basis that this rather distinctive type of cell formation does warrant ordinal recognition.

References:

BOLD, H.C. & WYNNE, M.J. (1978). Introduction to the Algae: Structure and reproduction. (Prentice-Hall: New Jersey.)

The Marine Benthic Flora of Southern Australia Part I complete list of references.

Author: H.B.S. Womersley

Publication: Womersley, H.B.S. (31 May, 1984)
The Marine Benthic Flora of Southern Australia
Part I
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