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Electronic Flora of South Australia Genus Fact Sheet


Phylum Phaeophyta – Order Dictyosiphonales – Family Myriotrichiaceae

Thallus tufted, 1–10 (–20) mm high, with basal, branched, prostrate filaments producing numerous erect axes, at first uniseriate but becoming multiseriate by longitudinal divisions in their upper parts. Growth at first terminal, becoming intercalary. Structure 1–5 cells thick, solid, with cells more or less in tiers but with smaller, irregularly placed, outer cells with several phaeoplasts each with a pyrenoid. Phaeophycean hairs terminal and lateral, scattered.

Reproduction: Reproduction by uniseriate plurilocular sporangia and sessile, opposite to whorled, unilocular sporangia.

Microthallus prostrate, branched, with plurilocular and unilocular sporangia.

Life history direct via the streblonemoid microthallus from either plurilocular or unilocular sporangia.

Type species: M. clavaeformis Harvey 1834: 299.

Taxonomic notes: A genus of several species from the North Atlantic and Mediterranean. Loiseaux (1969) found that the zooids of Hecatonema developed into a Myriotrichia, and Pedersen (1978) has presented evidence that M. filiformis Harvey and M. repens Hauck are environmental variants of M. clavaeformis, depending on salinity and light conditions, and he comments that their prostrate system is strikingly similar to Streblonema sphaericum.


HARVEY, W.H. (1834). Algological Illustrations. I. Remarks on some British algae, and descriptions of new species recently added to our flora. .1. Bot. (Hooker) 1, 296–305, Plates 188, 189.

LOISEAUX, S. (1969). Sur une espèce de Myriotrichia obtenue en culture à partir de zoides d'Hecatonema maculans Sauv. Phycologia 8, 11–15.

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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