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Cladophora feredayi Harvey 1858: pl. 47.

Phylum Chlorophyta – Order Cladophorales – Family Cladophoraceae

Selected citations: van den Hoek 1963: 221, figs. 700, 701, 706. Womersley 1956: 358.

Thallus (Fig. 62C,D) light to medium green, erect, 3–25 (–35) cm high with a single or usually densely clustered erect stipes, with the basal cell attached by branched rhizoids; filaments tapering gradually, much branched above usually at almost every cell, forming fastigate tufts. Growth acropetal (intercalary divisions absent or only very few in lower cells), with lateral branches first arising 1–5 cells below the apical cell, with ultimately 1–5 erect laterals (at acute angles) from each parent cell; cross walls at first oblique to parent cell, soon becoming almost horizontal.

Apical cells (Fig. 63D) (35–) 40–120 (–135) pm in diameter, L/B 6–25, linear to the tapering, obtuse to mucronate, apex; ultimate branch cells 40–170 µm in diameter, L/B (3–) 6–14; basal stipe cells 350–600 (–800) µm in maximum diameter, L/B 10–45; ratio of basal cell to apical cell diameters 5–12; walls thick, expecially in lower cells (25–60 µm), lamellate.

Reproduction: Reproduction: Upper cells are transformed into zooidangia (Fig. 63E) by more or less frequent intercalary divisions, with a basal abscission ring.

Lectotype from Georgetown, Tas. (Harvey, Alg. Aust. Exsicc. 584J); in Herb. Harvey, TCD.

Selected specimens: Cottesloe, W. Aust. (Smith, Dec. 1944; ADU, A2074). I km S.E. of Wanna, S. Aust., 0–1 m deep (Johansen, 2.xi.1981; ADU, A52712). Barker Rocks, S. Aust., I m deep (ran den Hoek 81/65,20.ix.1981; ADU, A52627). Port Elliot, S. Aust., drift (Womersley, 17.x.1948; ADU, A9330). Robe, S. Aust., reef pools, shaded (Womersley, 9.ix.1968; ADU, A32691). Norman Bay, Wilsons Prom., Vic. (Ducker, 14.xi.1962; MELU, 212). Currie R., Tas. (Perrin & Lucas, Jan. 1936; H0,44867). Tinderbox Bay, S.E. Tas., 1 m deep (Ferris, 2.ix.1979; ADU, A51713). Derwent R. (Est.), Tas. (Rodway, Sept. 1909; HO,44876, 44883/4). Bluestone Bay, N. Freycinet Pen., Tas., 6–10 m deep (Brown, McGeary & Womersley, 4.xi.1982; ADU, A54152).

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

Distribution: From Cottesloe, W. Aust. around southern Australia to Port Jackson, N.S.W. and around Tasmania.

New Zealand. Madeira. Adriatic.

Taxonomic notes: Cl. feredayi differs from Cl. bainesii in its more robust thallus with broader filaments; numerous stipes usually occur clustered together.

Variation within the specimens here referred to Cl. feredayi is very wide and largely overlaps with that of the widespread species Cl. pellucida (Hudson) Kützing, with which it is possibly conspecific. The apical cells vary greatly in diameter, with those of many specimens (e.g. ADU, A2074, A52627, HO, 44867 and 44876) within the range of 40–70 (–85) µm, while those of others (e.g. ADU, A32691 and A51713) are mostly 70–120 µm in diameter. However, the apical cells of A54152 are (65–) 75–110 (–140) µm in diameter, those of A9330 are (45–) 60–80 (–90) µm and those of A52712 are (45–) 50–80 (–120) µm. In all cases the form of the plant is very similar, and the authors consider these all belong to one species which varies with age, rapidity of growth and probably with ecological situation.


HARVEY, W.H. (1858). Phycologia Australica. Vol. 1, Plates 1–60. (Reeve: London.)

VAN DEN HOEK, C. (1963). Revision of the European species of Cladophora. (Brill: Leiden.)

WOMERSLEY, H.B.S. (1956). A critical survey of the marine algae of southern Australia. I. Chlorophyta. Aust. J. mar. freshw. Res. 7, 343–383.

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

Author: C. van den Hoek and 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 62C, D, 63D, E.

Figure 62 image

Figure 62   enlarge

Fig. 62. A. Cladophora prolifera (ADU, A52665). B. Cladophora bainesii (ADU, A42650). C. Cladophora feredayi, tufts (ADU, A3269 I ). D. Cladophora feredayi, separated stipes (ADU, A52712).

Figure 63 image

Figure 63   enlarge

Fig. 63. A,B. Cladophora prolifera (ADU, A52665). A. Upper branch system. B. Lower branch system with descending rhizoids and annular constrictions. C. Cladophora bainesii (Type in TCD). Upper branch system. D,E. Cladophora feredayi (D, ADU, A24413; E, ADU, A52627). D. Upper branch system. E. Reproductive cell with basal abscission ring.

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