Electronic Flora of South Australia Genus Fact Sheet

Genus ARTHROCLADIA Duby 1830: 971

Phylum Phaeophyta – Order Desmarestiales – Family Arthrocladiaceae

Thallus (sporophyte) 10–100 cm long, slender, terete, with long, usually opposite, branches 0.5–2 mm in diameter, clothed with whorls of free, determinate, fascicles 2–5 µm long, basally attached by a small, discoid holdfast. Growth trichothallic with a single apical filament to each branch, bearing whorls of usually four laterals, becoming corticated by rhizoids below the meristematic zone. Structure of a distinct axial filament surrounded by a large-celled medulla and outer, small-celled, cortex bearing the whorled fascicles of filaments. Gametophyte little known, filamentous (Sauvageau 1931, p. 104, figs 19,20,22).

Reproduction: Sporophyte with unilocular sporangia borne in moniliform chains on the lateral fascicles, each liberating motile meiospores.

Type and only species: A. villosa (Hudson) Duby.


DUBY, J.E. (1830). Botanicon Gallicum seu Synopsis Plantarum in Flora Gallica Descriptarum. Part 2, Plantas Cellulares continens. Edn 2. (Paris.)

SAUVAGEAU, C. (1931). Sur quelques Algues phéosporées de la rade de Villefranche (Alpes-Maritimes). Bull. Stn biol. Arcachon 28, 7–168.

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

Author: H.B.S. Womersley

Publication: Womersley, H.B.S. (14 December, 1987)
The Marine Benthic Flora of Southern Australia
Part II
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