Electronic Flora of South Australia Species Fact Sheet

Cladophora bainesii Mueller & Harvey ex Harvey 1859a: pl. 112.

Phylum Chlorophyta – Order Cladophorales – Family Cladophoraceae

Selected citations: Womersley 1956: 358.

Thallus (Fig. 62B) light to medium green, erect, (3–) 8–25 cm high, with one (or several) erect stipes basally attached by branched rhizoids; filaments gently tapering and much branched above every 1–2 (–4) cells, forming delicate, fastigiate tufts. Growth acropetal (intercalary divisions apparently absent in lower parts), with lateral branches first arising 2–6 cells from the apices (Fig. 63C) with ultimately 1–3 (–4) erect laterals (at acute angles) from each parent cell; cross walls at first oblique to parent cell, soon becoming almost horizontal.

Apical cells 14–25 (–35) µm in diameter, L/B 7–24, linear to the tapering, obtuse to mucronate apices; ultimate branch cells 15–35 µm in diameter, L/B 6–17; basal cells (150–) 200–300 (–600) µm in maximum diameter, L/B (10–) 20–70; ratio of basal cell to apical cell diameters 7–10 (–30); walls 2–4 µm thick above, relatively thick below (8–15 µm), especially adjacent to cross walls.

Reproduction: Reproduction: upper cells are transformed into zooidangia by more or less frequent intercalary divisions. Each zooidangium opens by one apical pore, and the empty zooidangium is shed by means of a characteristic basal abscission ring in the sporangial wall. Quadriflagellate zoospores were observed once.

Lectotype from Port Phillip, Vic. (Harvey, Alg. Aust. Exsicc.579F); in Herb. Harvey, TCD; isolectotype in MEL, 597498.

Selected specimens: 5 km off Port Noarlunga, Gulf St Vincent, S. Aust., 21–24 m deep, (Ottaway, 3 and 8.xii.1980; ADU, A52111 and A52103 resp.). Port Phillip, Vic. (Mueller; ADU, A19730). Low Head, Tas. (Perrin, 1926: ADU, A47080). River Derwent (Est.), Tas., 15 m deep (Rodwav, 4.xii.1909; HO 44880).


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

Distribution: From Redcliff, Spencer Gulf, and Vivonne Bay, Kangaroo I., S. Aust. to Port Phillip, Vic. and around Tasmania.

Taxonomic notes: This seems to be a deep-water species.

Cl. bainesii is a distinctive species of Section Longiarticulatae Hamel (van den Hoek 1963, p. 208). It is slenderer than any other species of this group, and most closely related to the more robust Cl. feredayi, which is of similar habit but has apical cells 40–120 µm in diameter and generally broader lower and basal cells.

References:

HARVEY, W.H. (1859a). Phycologia Australica. Vol. 2, Plates 61–120. (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 62B, 63C.

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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