Electronic Flora of South Australia Genus Fact Sheet

Genus ERYTHRONAEMA J. Agardh 1892: 97

Phylum Rhodophyta – Class Florideophyceae – Order Gigartinales – Family Cystocloniaceae

Thallus erect, furcately or laterally branched, branches terete, slender; holdfast fibrous. Structure uniaxial, with a small apical cell in an acute apex, axial filament apparent throughout, medulla pseudoparenchymatous with a smaller-celled cortex and weakly developed rosettes.

Reproduction: Sexual thalli probably dioecious. Cystocarps external, globular, carposporophyte with a basal group of small cells and radiating gonimoblast filaments with terminal chains of carposporangia; pericarp well-developed, without an ostiole. Spermatangia unknown.

Tetrasporangia scattered in the cortex, zonately divided.

Life history triphasic with isomorphic gametophytes and tetrasporophytes.

Type (and only) species: E. ceramioides J. Agardh 1892: 98.

Taxonomic notes: Erythronaema has been a little known taxon, recorded only from Wilson's original collections. However, it has been found recently at Port Noarlunga, S. Aust. The weak surface rosettes of outer cortical cells, uniaxial structure, cystocarp structure and zonate tetrasporangia support its placement in the Cystocloniaceae.


AGARDH, J.G. (1892). Analecta Algologica. Acta Univ. lund. 28, 1–182, Plates 1–3.

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

Author: H.B.S. Womersley

Publication: Womersley, H.B.S. (14 January, 1994)
The Marine Benthic Flora of Southern Australia
Rhodophyta. Part IIIA, Bangiophyceae and Florideophyceae (to Gigartinales)
Reproduced with permission from The Marine Benthic Flora of Southern Australia Part IIIA 1994, by H.B.S. Womersley. Australian Biological Resources Study, Canberra. Copyright Commonwealth of Australia.

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