Electronic Flora of South Australia Species Fact Sheet
Phylum Chlorophyta – Order Cladophorales – Family Cladophoraceae
Selected citations: van den Hoek 1963: 122, figs 392–408.
Thallus (Fig. 64B) light to medium green, single or in clusters, forming pompons when small and fastigiate tufts when large, 2–15 (–30) cm high with the pseudodichotomous axes arising from a base of matted rhizoids from the lowest cells; epilithic or epiphytic; filaments tapering only slightly, much branched from almost every cell above with straight to falcate or refract and often unilaterally arranged branchlets (Fig. 65C). Growth acropetal and mainly apical above, with intercalary divisions in the mid and lower thallus cells thus separating the laterals by 2–8 cells but with few branches arising below intercalary cross walls; each parent cell bearing 1–2 (–3) laterals mostly at an angle of 45° or more, sometimes less; basal cross walls of laterals oblique to parent cell, later often becoming almost horizontal.
Apical cells (80–) 100–120 (–160) pm in diameter, L/B 3–8, cylindrical, sometimes slightly inflated, with rounded apices; ultimate branch cells (85–) 100–120 µm in diameter, L/B 2–6; lower thallus cells (140–) 180–220 (–250) µm in maximum diameter, L/B 2–7; ratio of lower cell to apical cell diameters 1.5–2.5; cell walls thin to moderately thick (10–15 µm) near the base.
Reproduction: Reproduction by somewhat inflated apical or subapical cells forming zooidangia; (Fig. 65D); in Europe by quadriflagellate zoospores (van den Hoek 1963, p. 124).
Type from Helgoland; isotypes in L (937, 281 .. . 47) and LD (9341–9343).
Selected specimens: Entrance to Kellidie Bay, Coffin Bay, S. Aust., very low eulittoral (Womersley, 22.viii.1967; ADU, A31818). Cape Carnot, S. Aust., low eulittoral (Womersley, 8.i.1951; ADU, A13802). Barker Rocks, Yorke Pen., S. Aust., upper sublittoral on Cladostephus (van den Hoek 81/65, 20.ix.1981; ADU, A52670). Pondalowie Bay, Yorke Pen., S. Aust., mid eulittoral on wave-washed ledges (van den Hoek 81/58, 19.ix.1981; ADU, A52616). Pondalowie Bay, Yorke Pen., S. Aust., shallow sublittoral rocks within sheltered inner bay (Lipkin, 19.ix.1981; ADU, A52617). Robe, S. Aust., upper sublittoral pools in bay (Womersley, 11.xii.1969; ADU, A34858-"Marine Algae of southern Australia" No. 222). Apollo Bay, Vic., low eulittoral pools, on Cladostephus (Womersley, 26.i.1964; ADU, A28054). Penguin, Tas., mid eulittoral (Curtis, 20.i.1954; HO, 44870). Orford, Tas., mid eulittoral pools (Kingsbury, 14.ii.1980; HO, 41515).
Distribution: Warm temperate Atlantic and Mediterranean coasts of Europe (van den Hoek 1963, p. 125).
In southern Australia, from Geraldton, W. Aust. to Walkerville, Vic., and around Tasmania, in pools and shallow water under moderate water movement.
Taxonomic notes: Cl. lehmanniana is closely related to the more robust Cl. valonioides (apical cells over 150 µm in diameter) and to the less robust Cl. laetevirens (apical cells mostly less than 80 µm in diameter). These three species have similar thallus organisation and development but are distinct on cell dimensions.
KÜTZING, F.T. (1843). Phycologia generalis. (Leipzig.)
VAN DEN HOEK, C. (1963). Revision of the European species of Cladophora. (Brill: Leiden.)
The Marine Benthic Flora of Southern Australia Part I complete list of references.
Womersley, H.B.S. (31 May, 1984)
The Marine Benthic Flora of Southern Australia
©Board of the Botanic Gardens and State Herbarium, Government of South Australia
Illustrations in Womersley Part I, 1984: FIGS 64B, 65C,D.
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 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.
State Herbarium of South Australia