Electronic Flora of South Australia Family Fact Sheet


Phylum Phaeophyta – Order Dictyosiphonales

Thallus tufted, 1–10 (–20) mm high, with basal filaments producing numerous erect axes, at first uniseriate but becoming multiseriate and polystichous in their upper parts. Growth at first terminal, becoming intercalary. Structure 1–5 cells thick, solid, outer cells with several phaeoplasts each with a pyrenoid, bearing numerous, scattered to whorled, phaeophycean hairs.

Life history direct via the microthallus, from either plurilocular or unilocular sporangia. Reproduction by uniseriate plurilocular sporangia and relatively large unilocular sporangia, opposite to whorled or clustered on upper parts of the erect axes, sessile.

Taxonomic notes: Microthallus prostrate, branched, streblonemoid, bearing plurilocular and unilocular sporangia.

A monogeneric family based on Myriotrichia Harvey, the species of which have been discussed by Pedersen (1978), who also regards the Myriotrichiaceae as an advanced rather than a primitive family of the Dictyosiphonales.


PEDERSEN, P.M. (1978). Culture studies in the pleomorphic brown alga Myriotrichia clavaeformis (Dictyosiphonales, Myriotrichiaceae). Norw. J. Bot. 25, 281–291.

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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