Electronic Flora of South Australia Species Fact Sheet

Codium galeatum J. Agardh 1887: 42, pl. 1 fig. 1.

Phylum Chlorophyta – Order Codiales – Family Codiaceae

Selected citations: Lucas 1936: 54, fig. 35a. Silva & Womersley 1956: 273, fig. 9.

Thallus (Fig. 77E) medium green, firm, erect, regularly and frequently dichotomously branched, to l m high, with branches uniformly terete, not tapering, 4–7 mm in diameter. Utricles (Fig. 78F) stout, irregularly cylindrical to clavate, (130–) 200–500 (–700) µm in maximum diameter (below apex), (650–) 750–1300 (–1500) µm long; utricle apical wall rounded to truncate, moderately to (usually) markedly thickened forming a laminate galeate cap up to 125 µm thick; hairs (or scars) occasional, one to few per utricle. Medullary filaments usually 30–80 µm in diameter, with a prominent plug adjacent to origin from utricle. Gametangia elongate-ovoid to cylindrical, 55–185 µm in diameter, 275–530 µm long.

Lectotype from Port Phillip, Vic.; in Herb. Agardh, LD, 15588.

Selected specimens: Port Denison, W. Aust., drift (Parsons, 8.xi.1968; ADU. A33155). City Beach, Perth, W. Aust. (Royce 1196, 7.v.1952; PERTH, UC). Avoid Bay, S. Aust., drift (Womersley, 30.xi.1975; ADU, A46820). Pennington Bay, Kangaroo I., S. Aust., sublittoral fringe (Womersley, 29.xii.1948; ADU, A10536). Margaret Brock Reef, Cape Jaffa, S. Aust.. 10 m deep (Lewis, 15.ii.1974; ADU, A45022). Sorrento, Vic., shaded pool ( Woinersley, 2.vi.1953; ADU, A18831).

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

Distribution: From Champion Bay, W. Aust. around southern Australia and Tasmania to Ballina, N.S.W.

Taxonomic notes: C. galeatum is a common species on rough-water coasts along southern Australia, from low tide level down to 37 m. The robust, regularly dichotomous thallus and large utricles with galeate caps are characteristic.


AGARDH, J.G. (1887). Till algernes systematik. VIII. Siphoneac. Acta Univ. hind. 23, 1–180. Plates 1–5.

LUCAS, A.H.S. (1936). The Seaweeds of South Australia. Pt. I. Introduction and the Green and Brown Seaweeds. (Govt Printer: Adelaide.)

SILVA, P.C. & WOMERSLEY, H.B.S. (1956). The genus Codium (Chlorophyta) in southern Australia. Aust. J. Bot. 4, 261–289.

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

Author: H.B.S. Womersley

Publication: Womersley, H.B.S. (31 May, 1984)
The Marine Benthic Flora of Southern Australia
Part I
©Board of the Botanic Gardens and State Herbarium, Government of South Australia

Illustrations in Womersley Part I, 1984: FIGS 77E, 78F.

Figure 77 image

Figure 77   enlarge

Fig. 77. A. Codium mamillosum (ADU, A43513). B. Codium pomoides (ADU, A46816). C. Codium laminarioides (ADU, A50719). D. Codium silvae (ADU, A50695, type). E. Codium galeatum (ADU, A46820). F. Codium duthieae (ADU, A37513).

Figure 78 image

Figure 78   enlarge

Fig. 78. Utricle clusters with gametangia. A. Codium mamillosum (Royce 1200, in PERTH, UC). B. Codium pomoides (Cribb 75.16 in UC). C. Codium laminarioides (Cribb 61.42 in UC). D. Codium silvae (ADU, A50695, type). E. Codium silvae, apex of utricle. F. Codium galeatum (lectotype left and Royce 1196 right). G. Codium duthieae (ADU, A13624). (After Silva & Womersley 1956.)

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