Electronic Flora of South Australia Family Fact Sheet
Phylum Phaeophyta – Order Sphacelariales
Thallus usually densely tufted with several subdichotomous erect axes from a crustose base, usually epilithic. Branching of main axes and laterals hypacroblastic, with more or less verticillately arranged determinate laterals arising from the superior secondary axial segments, and with acroblastic branching; phaeophycean hairs present; segments of main axes showing secondary growth in length and width (auxocaulic) and becoming corticated by several layers of isodiametric cells.
Reproduction: Reproduction by unilocular sporangia or plurilocular gametangia with isogametes, borne laterally on determinate laterals produced from the outer cortical cells.
Life history diplohaplontic and isomorphic.
Taxonomic notes: A family of a single genus characterised by the subdichotomous axes bearing short, determinate, whorled or irregularly disposed laterals.
References: The Marine Benthic Flora of Southern Australia Part II
Womersley, H.B.S. (14 December, 1987)
The Marine Benthic Flora of Southern Australia
©Board of the Botanic Gardens and State Herbarium, Government of South Australia
State Herbarium of South Australia