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Electronic Flora of South Australia Species Fact Sheet

Chroodactylon ornatum (C. Agardh) Basson 1979: 67.

Phylum Rhodophyta – Class Bangiophyceae – Order Porphyridiales – Family Porphyridiaceae

Selected citations: Cribb 1983: 9, pl. 1 figs 7, 8. John et al. 1979: 72. Entwisle & Kraft 1984: 218, fig. 3C, D.


Conferva ornata C. Agardh 1824: 104.

Asterocytis ornata (C. Agardh) Hamel 1924: 451, fig. 7B–E. Chapman 1969: 6, fig. 2. Levring 1953: 460. Tanaka 1952: 11, fig. 6.

Hormospora ramosa Thwaites in Harvey 1848: pl. 213.

Thallus (Fig. 1C) minute, tufted, 0.2–4 mm high, occasionally branched with an unspecialised basal attachment cell; epiphytic. Filaments 10–18 µm in diameter, with more or less separated ovoid cells, 10–16 µm long and 5–8 µm in diameter, within the mucilaginous sheath; plastids (Fig. 1C) stellate with a central pyrenoid, blue-green.

Reproduction: Reproduction by akinetes (Rosenvinge 1909, p. 79).

Published illustration: Womersley Part IIIA, 1994: FIG. IC.

Type from Lake Malaren, Sweden; in Herb. Agardh, LD?

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

Distribution: Widely distributed in northern temperate regions.

In southern Australia known from records of Levring (1953, p.461) from Pennington Bay and Pelican Lagoon, American R. Inlet, Kangaroo I., S. Aust. (the latter 10.i.1948; AD, A19851) and from East Tamar, Low Head, Tas., Botany Bay and Burraneer, Port Hacking, N.S.W., epiphytic (Levring, 16.xi.1947; AD, A59568).

Taxonomic notes: C. ornatum is more common in brackish than marine waters, and was recorded from two freshwater localities in Victoria by Entwisle & Kraft (1984, p. 220).


AGARDH, C.A. (1824). Systema Algarum. (Berling: Lund.)

BASSON, P.W. (1979). Marine algae of the Arabian Gulf Coast of Saudi Arabia (second half). Bot. Mar. 22, 65–82.

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

CRIBB, A.B. (1983). Marine algae of the southern Great Barrier Reef. Part I. Rhodophyta. (Aust. Coral Reef Soc., Handbook 2: Brisbane.)

ENTWISLE, T.J. & KRAFT, G.T. (1984). Survey of freshwater red algae (Rhodophyta) of south-eastern Australia. Aust. J. Mar. Freshw. Res. 35, 213–259.

HAMEL, G. (1924). Floridées de France. Bangiales. Rev. Algol. 1, 278–292, 427–457.

HARVEY, W.H. (1848). Phycologia Britannica. Plates 145–216. (Reeve: London.)

JOHN, D.M., PRICE, J.H., MAGGS, C.A. & LAWSON, G.W. (1979). Seaweeds of the western coast of tropical Africa and adjacent islands: a critical assessment. HI. Rhodophyta (Bangiophyceae). Bull. Br. Mus. Nat. Hist. (Bot.) 7, 69–82.

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.

TANAKA, T. (1952). The systematic study of the Japanese Protoflorideae. Mem. Fac. Fish. Kagoshima Univ. 2, 1–92, Plates 1–23.

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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