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Electronic Flora of South Australia Species Fact Sheet

Erythrocladia irregularis Rosenvinge 1909: 72, figs 11, 12.

Phylum Rhodophyta – Class Bangiophyceae – Order Compsopogonales – Family Erythrotrichiaceae

Selected citations: Chapman 1969: 8, fig. 3B. Garbary et al. 1980b: 154, fig. 4a-h. Heerebout 1968: 141, figs 1–4. Kornmann & Sahling 1985: 223, fig. 7. Levring 1953: 461.

Thallus (Fig. 111) minute (usually 20–100 µm in diameter), forming irregular discs of radiating branched filaments, usually not closely adherent laterally and free at the margins, branching from subapical cells, becoming polystromatic centrally; cells (Fig. 1H) 1.5–6 (–10) µm in diameter, 2–15 (–20) µm long, rhodoplasts single, parietal, with a pyrenoid.

Reproduction: Reproduction by monospores liberated from sporangia cut off from central cells in the polystromatic region, 3–5 µm in diameter.

Type from Mollegrund, Denmark, on Polysiphonia urceolata, 11–15 m deep; syntype in C (see Dawson 1953, p. 5).

Selected specimens: Coffin Bay, S. Aust., on Chaetomorpha linum, upper sublittoral (Woelkerling, 22.viii.1967; AD, A31991).

Distribution map based
on current data relating to
specimens held in the
State Herbarium of SA

Distribution: Cosmopolitan.

Probably widespread along southern Australia but usually overlooked and not preserved in herbaria. Recorded by Levring (1953, p. 462) from Cottesloe, W. Aust., around southern Australia and Tasmania to Palm Beach, N.S.W.

Taxonomic notes: The uncertain relationships of other species with the type species are discussed above.


CHAPMAN, V.J. (1969). The marine algae of New Zealand. Part III: Rhodophyceae. Issue 1: Bangiophycidae and Florideophycidae (Némalionales, Bonnemaisoniales, Gélidiales). (Cramer: Germany.)

DAWSON, E.Y. (1953). Marine red algae of Pacific Mexico. Part I. Bangiales to Corallinaceae subf. Corallinoideae. Allan Hancock Pacif. Exped. 17, 1–239.

GARBARY, D.J., HANSEN, G.I. & SCAGEL, R.F. (1980b). The marine algae of British Columbia and northern Washington: Division Rhodophyta (red algae), Class Bangiophyceae. Syesis 13, 137–195.

HEEREBOUT, G.R. (1968). Studies on the Erythropeltidaceae (Rhodophyceae - Bangiophycidae). Blumea 16, 139–157.

KORNMANN, P. & SAHLING, P.-H. (1985). Erythropeltidaceen (Bangiophyceae, Rhodophyta) von Helgoland. Helgoländer Meeresunters. 39, 213–236.

LEVRING, T. (1953). The marine algae of Australia. I. Rhodophyta: Goniotrichales, Bangiales and Némalionales. Arkiv för Bot. Ser. 2, 2, 457–530.

ROSENVINGE, L.K. (1909). The marine algae of Denmark. Part 1. Introduction. Rhodophyceae. 1. (Bangiales and Némalionales). K. danske Vidensk. Selsk. Biol. Skr., 7 Raekke, Afd. 7, 1–151, Plates 1, 2,2 maps.

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.

Illustration in Womersley Part IIIA, 1994: FIG. 1 H.

Figure 1 image

Figure 1   enlarge

Fig. 1. A, B. Porphyridium purpureum (AD, A59695). A. Cells in patches on Dictyota fenestrata. B. Cells each with a rhodoplast and central pyrenoid. C. Chroodactylon ornatum (AD, A19851). Thallus showing branching pattern and cell detail. D, E. Stylonema alsidii (AD, A58642). D. Branching pattern. E. Cells each with a stellate rhodoplast and pyrenoid. F, G. Stylonema cornu-cervi (AD,A58644). F. Thallus (on Caulerpa) showing cell arrangement. G. Cells each with a rhodoplast and pyrenoid. H. Erythrocladia irregularis (on AD, A31991 of Chaetomorpha linum). Thallus showing branching pattern of cells and cell detail. I. Erythrocladia subintegra (AD, A58641). Thallus showing branching pattern of cells and detail in a few.

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