Electronic Flora of South Australia Species Fact Sheet
Phylum Chlorophyta – Order Caulerpales – Family Udoteaceae
Selected citations: Womersley 1956: 372; 1971a: 116, fig. 10.
Thallus (Fig. 83E) dark green to brown-green, usually 10–25 cm high, with a matted holdfast giving rise to 1 to 8 fronds each with a long stipe expanding above to a cuneate lamina; stipes (4–) 8–15 cm long and 0.5–1 cm in diameter; lamina usually 4–8 cm long and 4–8 cm broad, often zoned, (0.2–) 0.5–1 (–2) mm thick. Filaments (Fig. 851) of lamina 35–55 µm in diameter, relatively straight to slightly undulate, often torulose near their subclavate apices (Fig. 85J), constricted at dichotomies (Fig. 85K); chloroplasts and amyloplasts ovoid (Fig. 85K); a yellowish inclusion often present in upper filaments.
Reproduction: Reproduction unknown.
Type from Corio Bay, Port Phillip, Vic. (Wilson); in BM.
Selected specimens: Point Clune, Rottnest I., W. Aust., 14 m deep in cave (Ricker & Kraft, 5.xii.1980; ADU, A52187, MELU, 2252). Eucla, W. Aust., drift (Parsons, 5.xi.1968; ADU, A33962). Waldegrave I., off Eyre Pen., S. Aust., 22 m deep (Shepherd, 23.x.1970; ADU, A47193-"Marine Algae of southern Australia" No. 15). Aldinga, S. Aust., 3 m deep (Clarke, 14.xii.1981; ADU, A52785). Investigator Strait, S. Aust., 27 m deep (Watson, Stn X4, 9.i.1971; ADU, A38605).
Distribution: From Rottnest I., W. Aust., to Port Phillip, Vic.
Taxonomic notes: A. clavatiramea appears to be essentially a deep water species (14–27 m deep), usually growing in a sandy substrate; off Aldinga, it grows in 2–4 m depth near the base of vertical faces (and so shaded) with considerable sediment around it.
A collection from Hopetoun, Western Australia, 3–4 metres deep near jetty (Kraft (6993) & Ricker, 16.viii.1979; ADU, A50721) is provisionally referred to A. clavatiramea but differs in being only 5–6 cm high and with 1–3 branches from the stipe and irregularly lobed above. However, the filament characteristics are similar to those of A. clavatiramea and it is likely that these are only young, perhaps somewhat unusual, plants of this species.
GEPP, A. & GEPP, E.S. (1911). The Codiaceae of the Siboga Expedition, including a monograph of Flabellarieae and Udoteae. Monogr. Siboga-Exped. 62, 1–150, Plates 1–22.
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.
WOMERSLEY, H.B.S. (1971a). New records and taxa of marine Chlorophyta in southern Australia. Trans. R. Soc. S. Aust. 95, 113–120.
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 83E, 85 I–K.
Figure 83 enlarge
Fig. 83. A. Callipsygma wilsonis (ADU, A37818). B. Rhipilia pusilla (ADU, A32893). C. Rhipiliopsis peltata (ADU, A37817). D. Rhipiliopsis robusta (ADU, A41215). E. Avrainvillea clavatiramea (ADU, A33962).
Figure 85 enlarge
Fig. 85. A–C. Rhipilia pusilla (ADU, A32893). A. Filaments of thallus. B. Filaments with lateral tenaculum attachment. C. Filament with tenaculum, and chloroplasts and amyloplasts. D–E. Rhipiliopsis peltata (ADU, A51874). D. Filaments with lateral zooidangia on lower filaments and several lateral attachment areas. E. Details of filaments near surface, with chloroplasts and amyloplasts. F–H. Rhipillopsis rohusta (ADU, A41215). F. Filaments with several lateral connections as seen in lengthwise section of the thallus. G. Segments with perforated end walls and lateral connections. H. Part of segment with chloroplasts and amyloplasts. I–K. Avrainvillea clavatiramea (ADU, A33962). I. Filaments from upper thallus. J. Upper branch. K. Branch of a filament, with chloroplasts and amyloplasts.
State Herbarium of South Australia