Electronic Flora of South Australia Genus Fact Sheet
Phylum Phaeophyta – Order Fucales – Family Cystoseiraceae
Thallus usually 30–100 cm long, robust, complanately branched, with a short, single stipe and one to a few primary and secondary branches bearing from their margins alternate laterals; holdfast discoid-conical. Primary (and secondary) branches relatively thick, mostly 4–15 mm broad and 1–2 (–3) mm thick, smooth-surfaced, margins entire. Laterals simple, basally constricted and usually with broad apices, linear to lanceolate or oblanceolate, entire, mostly 5–15 cm long and 6–15 mm broad; vesicles absent. Growth from a three-sided apical cell. Structure of a central medulla with rhizoids and a cortex of isodiametric cells, increasing in thickness from the surface meristoderm.
Reproduction: Receptacles developed from laterals, with densely scattered conceptacles over the surface but with a sterile margin, smooth surfaced; conceptacles bisexual, oogonia with a single egg.
Type and only species: C. confluens (R. Brown ex Turner) Kützing.
Taxonomic notes: This monotypic genus is endemic to southern Australia. It is most closely related to Myriodesma, differing in the much thicker thallus and the single, simple, stipe.
KÜTZING, F.T. (1843). Phycologia generalis. (Leipzig.)
The Marine Benthic Flora of Southern Australia Part II complete list of references.
Womersley, H.B.S. (14 December, 1987)
The Marine Benthic Flora of Southern Australia
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