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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.
References:
KÜTZING, F.T. (1843). Phycologia generalis. (Leipzig.)
The Marine Benthic Flora of Southern Australia Part II complete list of references.
Publication:
Womersley, H.B.S. (14 December, 1987)
The Marine Benthic Flora of Southern Australia
Part II
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