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Electronic Flora of South Australia Species Fact Sheet

Bachelotia antillarum (Grunow) Gerloff 1959: 38.

Phylum Phaeophyta – Order Ectocarpales

Selected citations: Clayton 1974: 751, fig. 2. Magne 1976: 309, figs 1–16. Womersley 1967: 190.


Pilayella antillarum (Grunow) De Toni. Blomquist 1958, 25, figs 1–17. B. fulvescens (Bornet) Hamel. Lindauer et al. 1961: 141, fig. 1 (4,5).

Thallus (Fig. 2B) forming mats 1–10 cm across in the mid eulittoral, filaments usually 1–3 (–5) cm long, with an entangled, branched base attached by rhizoids, and erect, usually sparsely branched filaments (Fig. 4A) but with clustered, short branches in places; filaments of similar diameter [(30–) 35–45 (–55) µm] throughout (Fig. 4B), cells L/B 1–1.5 (–2.5); hairs absent. Growth diffuse, with prominent meristematic regions in the lower parts of filaments (Fig. 4B). Cells with one or two stellate groups of phaeoplasts.

Reproduction: Unilocular sporangia formed in series (Fig. 4C), with occasional longitudinal divisions giving two side-by-side sporangia, producing zoospores, and probably also germinating asexually (Clayton 1974, p. 753).

Type from Guadaloupe, Caribbean; in W(?).

Selected specimens: Point Sinclair, S. Aust., low eulittoral (Womersley, 9.ii.1954; ADU, A19559). Pennington Bay, Kangaroo I., S. Aust., rear (mid) eulittoral (Womersley, 19.i.1948; ADU, A6463). Point Bunbury, Apollo Bay, Vic., low eulittoral pool (Womersley, 12.iv.1959; ADU, A22657). Halfmoon Bay, Bicheno, Tas., pools ( Wollaston, 13.viii.1965; ADU, A29600). Bridport, Tas., mid eulittoral pools (Skinner, 23.ii.1978; ADU, A49210).

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

Distribution: Widespread in warm temperate to tropical seas, forming mats or turfs on rock at a lower and mid eulittoral level.

In southern Australia, from Point Sinclair, S. Aust., to Nambucca Heads, N.S.W., and around Tasmania.

Taxonomic notes: B. antillarum is often common on well-washed lower and mid eulittoral rock, and around pools, especially during summer months.


BLOMQUIST, H.L. (1958). The taxonomy and chromatophores of Pylaiella antillarum (Grunow) De Toni. J. Elisha Mitchell Sci. Soc. 74, 25–30.

CLAYTON, M.N. (1974). Studies on the development, life history and taxonomy of the Ectocarpales (Phaeophyta) in southern Australia. Aust. J. Bot. 22, 743–813.

GERLOFF, J. (1959). Bachelotia (Bornet) Kuckuck ex Hamel oder Bachelotia (Bornet) Fox? Nova Hedwigia 1, 37–39.

LINDAUER, V.W., CHAPMAN, V.J. & AIKEN, M. (1961). The marine algae of New Zealand. II. Phaeophyceae. Nova Hedwigia 3, 129–350, Plates 57–97.

MAGNE, F. (1976). Quelques caractères cytologiques particuliers du Bachelotia antillarum (Phéophycées, Ectocarpales). Phycologia 15, 309–319.

WOMERSLEY, H.B.S. (1967). A critical survey of the marine algae of southern Australia. II. Phaeophyta. Aust. J. Bot. 15, 189–270.

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

Author: H.B.S. Womersley

Publication: Womersley, H.B.S. (14 December, 1987)
The Marine Benthic Flora of Southern Australia
Part II
©Board of the Botanic Gardens and State Herbarium, Government of South Australia

Illustrations in Womersley Part II, 1997: FIGS 2B, 4 A–C.

Figure 2 image

Figure 2   enlarge

Fig. 2. A. Asteronema ferruginea on Hormosira (ADU, A52853). B. Bachelotia antillarum (ADU, A49210). C. Kuckuckia spinosa on Amphibolis (ADU, A39457). D. Ectocarpus siliculosus (ADU, A54422). E. Ectocarpus fasciculatus on Ecklonia (ADU, A32006).

Figure 4 image

Figure 4   enlarge

Fig. 4. A–C. Bachelotia antillarum (ADU, A22657). A. Basal and erect filaments. B. Filament with lower meristematic region and upper mature cells with stellate phaeoplasts. C. Filament with unilocular sporangia. D–I. Kuckuckia spinosa (D–H, ADU, A39457; I, ADU, A55784). D. Branch system with terminal phaeophycean hairs and sessile sporangia. E. Base of filament with rhizoids. F. Terminal phaeophycean hair with a basal meristem. G. Cell of lower filament with elongate phaeoplasts (with pyrenoids) and clustered physodes. H. Mid filament with two pedicellate plurilocular sporangia. I. Branches with unilocular sporangia.

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