Electronic Flora of South Australia Species Fact Sheet

Vaucheria velutina C. Agardh 1824: 312.

Phylum Chrysophyta – Class Xanthophyceae – Order Vaucheriales – Family Vaucheriaceae

Selected citations: Christensen 1973: 516, fig. 2A–H; 1987a: 28, fig. 8A,B.

Synonym

V. thuretii Woronin 1869: 157, p1. 2 figs 30–32. Blum 1972: 11, fig. 30. Ott & Hommersand 1974: 383, figs 31–34.

Thallus dark green, forming dense and extensive turfs up to many metres across and 1–2 cm high, in sheltered lower eulittoral situations. Filaments sparingly branched, (45–) 60–100 µm in diameter, coenocytic; chloroplasts discoid to lenticular, 2–3 µm broad, each with a pyrenoid.

Reproduction: Aplanosporangia not observed, but reported from elsewhere (Christensen 1987a, p. 28).

Thalli monoecious. Oogonia (Fig. 169A) sessile on vegetative filaments, erect or oblique, ovoid to subspherical, 220–32011m long and 150–260 µm in diameter, readily lost from filaments; oospores subspherical, 150–240 gm in diameter, wall 2–3 µm thick, smooth, not filling the oogonium especially above and below. Antheridia (Fig. 169A) sessile, single or several on the filament adjacent to oogonia, erect or oblique, ovoid to ellipsoid, 80–140 pm long and 50–75 µm in diameter (L/B 1.4–2.5), with a narrower, apical, dehiscence pore.

Type from Gråen, Sweden; in Herb. Agardh, LD, 14700.

Selected specimens: Between Coobowie and Edithburgh, S. Aust., low eulittoral (Brock, 17.iii.1984; ADU, A55088). Port Clinton, S. Aust., mid eulittoral (Womersley, 18.ix.1981; ADU, A52911). Taperoo, Lefevre Pen., S. Aust., lower eulittoral in harbour (Brock, 12.xi.1986; ADU, A57270 and Wittesch, 26.iii.1987; ADU, A57435). Onkaparinga Est. mouth, S. Aust., lower eulittoral (Brock, 9.v.1987; ADU, A57484). American R. inlet, Kangaroo I., S. Aust., 2 m deep in channel (Womersley, 6.ii.1956; ADU, A20068).


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

Distribution: Widespread.

In southern Australia, known from Edithburgh to Lefevre Peninsula, and the north coast of Kangaroo I., S. Aust., but probably far more widespread.

Taxonomic notes: V. velutina is characterised by the sessile oogonia with adjacent, short and more or less ovoid antheridia.

References:

AGARDH, C.A. (1824). Systema Algarum. (Lund.)

BLUM, J.L. (1972). North American Flora, Ser. II, Part 8. Vaucheriaceae. (N.Y. Bot. Gard.)

CHRISTENSEN, T. (1973). Some early Vaucheria descriptions. Bot. Not. 126, 513–518.

CHRISTENSEN, T. (1987a). Seaweeds of the British Isles. Vol. 4. Tribophyceae (Xanthophyceae). (British Museum: London.)

OTT, D.W. & HOMMERSAND, M.H. (1974). Vaucheriae of North Carolina. I. Marine and brackish water species. J. Phycol. 10, 373–385.

WORONIN, M. (1869). Beitrag zur Kenntnis der Vaucherien. Bot. Ztg 27, 137–144, 153–162, Plates I, II.

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


Illustration in Womersley Part II, 1997: FIG. 169A.

Figure 169 image

Figure 169   enlarge

Fig. 169. A. Vaucheria velutina (ADU, A57435). An oogonium and three adjacent antheridia. B–E. Vaucheria conifera. (B,C,from Type after Christensen 1987b, figs 17 and 9; D,E. ADU, A57482.). B. Oogonium with oospore. C. Filament with 3 antheridia. D. Filament with two oogonia. E. Filament with three antheridia. F. Vaucheria piloboloides (ADU, A57155). Oogonia (with distal oospores) and antheridia on adjacent filaments. G,H. Vaucheria longicaulis (ADU, A57483). G. Two oogonia. H. Three antheridia from a single filament. I–J. Vaucheria glomerata (ADU, A19793, holotype). I. Two oogonia with thick-walled oospores, protoplasmic masses, and basal cavity, with chloroplasts in part of filament. J. Clustered antheridia borne laterally on a vegetative filament with one cross wall.


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