Electronic Flora of South Australia Species Fact Sheet

Cladophora valonioides Sonder 1845: 49: 1846: 149.

Phylum Chlorophyta – Order Cladophorales – Family Cladophoraceae

Selected citations: Harvey 1859a: pl. 78. Lucas 1936: 27, fig. 10. Womersley 1956: 360.

Thallus (Fig. 64A) light to medium green, 3–18 (–25) cm high, singly or as clustered tufts of several plants, attached by rhizoids from the basal and adjacent cells; epilithic or epiphytic; filaments tapering only slightly, much branched above from almost every cell, forming fastigiate to spreading tufts, filaments straight or slightly incurved (Fig. 65A). Growth acropetal and mainly apical above, with intercalary divisions in lower cells thus separating the lower laterals by 2–6 cells (Fig. 65A); laterals first arising 1–3 cells from apex, ultimately with each parent cell bearing 1–3 (–4) laterals of varying length, often to some extent unilaterally arranged and at acute to 45° angles (Fig. 65A). Cross walls arising and remaining oblique to parent cell, or later becoming almost horizontal.

Apical cells (Fig. 65B) 170–300 µm in diameter, L/B 2–7, cylindrical with rounded ends; ultimate branch cells 170–280 µm in diameter, L/B 2–6; basal cells 300–365 tan in maximum diameter, L/B 2.5–14; ratio of lower cell to apical cell diameters 1–2; walls moderately thick, (4–) 6–8 µm in apical cells, 20–30 µm in mid thallus and 40–80 µm in lower cells, lamellate.

Reproduction: Reproduction by apical or sub-apical cells developing into slightly swollen or clavate zooidangia.

Type from W. Australia, probably near Perth (Preiss); Holotype in MEL, 597564. Isotypes in Herb. Harvey, TCD (3 specimens) and MEL, 597565.

Selected specimens: Near Perth, W. Aust. type material (MEL, TCD). Swan R., Perth, W. Aust., Alg. Aust. Exsicc. 587 (Herb. Harvey, TCD). Whitfords Beach, Perth, W. Aust., 4 m deep (Cook, 20.viii.1979; ADU, A50564). Ward I., W. of Flinders I., S. Aust., 18–23 m deep (Shepherd, 3.iii.1980; ADU, A50892). Elliston, S. Aust., reef surface (Womersley, 14.i.1951; ADU, A15128). Pearson I., S. Aust., 25 m deep (Shepherd, 28.iii.1982; ADU, A53016). Pennington Bay, Kangaroo I., S. Aust., drift ( Womersley, 4.i.1948; ADU, A6592).


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

Distribution: From Champion Bay, W. Aust. to Guichen Bay, S. Aust., on rough-water rock platforms and extending to 25 m deep. This appears to be essentially a western species though common on the south coast of Kangaroo I.

Taxonomic notes: Cl. valonioides is a distinctive species of Section Glomeratae, being considerably greater in apical cell dimensions than other species (see van den Hoek 1963, p. 30; 1982, p. 128). The closest Australian species is Cl. lehmanniana, which has apical cells usually less than 150 µm in diameter.

References:

HARVEY, W.H. (1859a). Phycologia Australica. Vol. 2, Plates 61–120. (Reeve: London.)

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

SONDER, O.W. (1845). Nova algarum genera et species quas in itinere ad oras occidentales Novae Hollandiae, collegit L. Preiss, Ph.Dr. Bot. Ztg 3, 49–57.

SONDER, O.W. (1846). Algae. In C. Lehmann, Plantae Preissianae. Vol. 2, pp. 148–160. (Hamburg.)

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 64A, 65A,B.

Figure 64 image

Figure 64   enlarge

Fig. 64. A. Cladophora valonioides (ADU, A53016). B. Cladophora lehmanniana (ADU, A34858). C. Cladophora laetevirens (ADU, A22489). D. Cladophora dalmatica (ADU, A52561). E. Cladophora vagabunda (ADU, A52692).

Figure 65 image

Figure 65   enlarge

Fig. 65. A,B. Cladophora valonioides (A, Isotype in TCD; B, ADU, A50892). A. Upper branch system. B. Upper branches to same scale as C–D. C–D. Cladophora lehmanniana (C, ADU, A52670; D, ADU, A52616). C. Upper branch system. D. Upper reproductive cells. E. Cladophora laetevirens (ADU, A22489). Upper branch system. F. Cladophora dalmatica (ADU, A52561). Upper branch system. G. Cladophora vagabunda (C. van den Hoek 81/65). Upper branch system.


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