Electronic Flora of South Australia Species Fact Sheet

Blidingia marginata (J. Agardh) P. Dangeard 1958: 59; 1961: 195, pls IB, IIA,B, III J-M.

Phylum Chlorophyta – Order Ulvales – Family Ulvaceae

Selected citations: Bliding 1963: 32, figs 12, 13.


Enteromorpha marginata J. Agardh. Hamel 1930: 152, fig. 46A.

E. nana var. marginata (J. Agardh) Chapman 1956: 416, fig. 63.

Blidingia minima sensu Womersley 1953: 36.

Thallus (Fig. 42E) grass-green, usually growing on basal stems of samphires or in shaded intertidal situations, 0.2–2 (–5) cm high and (50–) 100–300 (–1000) µm broad, simple or occasionally branched, arising from a multicellular pad-like holdfast of isodiametric to elongate cells (Fig. 43K). Cells arranged in lengthwise rows throughout the thallus (Fig. 43J), angular to rounded and mostly isodiametric, 6–8 (–9) µm across. Chloroplast filling the cell or slightly stellate, with a single, central, prominent pyrenoid.

Reproduction: Reproduction by quadriflagellate zoo(mito)spores (Bliding 1963, p. 34).

Lectotype from Nice, France; in Herb. Agardh, LD (14161).

Selected specimens: Coombe I., Recherche Arch., W. Aust., in shallow pools (Willis, 21.xi.1950; ADU, A15844). Ardrossan, S. Aust., mid eulittoral (Womersley, 7.iv.1950; ADU, A16080). Port Adelaide, S. Aust., mid eulittoral on mangroves, east side (Womersley, 14.vi.1957; ADU, A21065). I.C.I. saltfields, Port Adelaide, S. Aust., on stems of Sarcocornia, upper eulittoral (Gibbs-Clema, 16.xii.1981; ADU, A52990).

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

Distribution: Europe, Eastern N. America, New Zealand, in the mid to upper eulittoral zone in calm water samphire or Juncus communities.

In southern Australia, known from the Recherche Archipelago, W. Aust., Streaky Bay, Ardrossan and Port Adelaide and the I.C.I. saltfields, Port Adelaide, S. Aust.

Taxonomic notes: B. marginata is readily distinguished from B. minima in having the cells in well defined rows throughout the thallus. It is likely to be more widespread than indicated above, and probably confined to the lower stems of samphires and mangroves or other shaded situations.


BLIDING, C. (1963). A critical survey of European taxa in Ulvales. Part I. Capsosiphon, Percursaria, Blidingia, Enteromorpha. Opera Bot. 8(3), 1–160.

CHAPMAN, V.J. (1956). The marine algae of New Zealand. Part I. Myxophyceae and Chlorophyceae. J. Linn. Soc. Bot. 55 (360), 333–501, Plates 24–50.

DANGEARD, P. (1958). Observations sur quelques Ulvacées du Maroc. Le Botaniste 42, 5–63.

DANGEARD, P. (1961). Quelques particularites du genre Blidingia. Le Botaniste 44, 193–208.

HAMEL, G. (1930). Chlorophycées des côtes francaises. (Paris.)

WOMERSLEY, H.B.S. (1953). The Archipelago of the Recherche. IIIb. Marine algae. Aust. geogr. Soc. Rep. 1(3b), 36–39.

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

Author: 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 42E, 43J,K.

Figure 42 image

Figure 42   enlarge

Fig. 42. A. Percursaria percursa (ADU, A52661). B. Ulvaria oxysperma (ADU, A31812). C. Ulvaria shepherdii (ADU, A33006). D. Blidingia minima (ADU, A31811). E. Blidingia marginata (ADU, A21065).

Figure 43 image

Figure 43   enlarge

Fig. 43. A,B. Percursaria percursa (ADU, A52661). A. Biseriate filament, face view. B. Side view of filament. C,D. Ulvaria oxysperma (ADU, A31874). C. Cells near thallus margin. D. Lower part of thallus with cells developing attachment rhizoids. E–G. Ulvaria shepherdii (ADU, A33006). E. Cells in upper thallus. F. Lower cells with rhizoids. G. Cross section of thallus near base, with rhizoid producing cells. H,I. Blidingia minima (ADU, A53181). H. Cells in upper thallus. I. Base of thallus. J,K. Blidingia marginata (ADU, A52990). J. Cells in upper thallus. K. Base of thallus.

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