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

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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