|
|
|
|
|
|||||||||||
|
Electronic Flora of South Australia Species Fact Sheet
Phylum Chrysophyta – Class Xanthophyceae – Order Vaucheriales – Family Vaucheriaceae
Selected citations: Blum 1972: 29, figs 102,103. Christensen 1986: 23, fig. 6A–D; 1987a: 23, fig. 6A–D. Taylor & Bernatowicz 1952: 76, pl. 1 figs 1–14. Venkataraman 1961: 52, fig. 30.
Thallus medium to dark green, forming loose tufts on detritus or epiphytic, with erect filaments above. Filaments sparingly branched, 45–90 µm in diameter, coenocytic; chloroplasts discoid to lanceolate, 4–6 µm across, each with a pyrenoid.
Reproduction: Aplanosporangia clavate (Christensen 1987a, p. 23).
Thalli monoecious, with the sex organs on adjacent branches of erect filaments, the antheridia below the oogonia. Oogonia (Fig. 169F) pedicellate, clavate with a subglobose upper part and a partial ring-like wall where the oogonium broadens, 400–500 um long and 200–250 µm in diameter above, without a basal empty cell; oospores compressed transversely, ellipsoid to lenticular, situated in the upper part of the oogonium, 120–160 µm in longest dimension and 95–120 µm thick, wall 1–3 mm thick, smooth, usually without a lower protoplasmic mass in the oogonium. Antheridia (Fig. 169F) pedicellate, erect, subtended by an empty cell 25–80 (–120) µm long and 40–65 µm in diameter (L/D 1–2.5), cylindrical to fusiform, occasionally with a lateral branch, 240–350 µm long and 60–100(420) µm in diameter, with a terminal and 1–4 lateral discharge pores on prominent conical protuberances 25–50 (–70) µm long.
Type from Saint-Vaast-La-Houge, Normandy, France; in PC.
Distribution: Widespread in temperate seas.
Taxonomic notes: The above collection agrees well with V. piloboloides and may be an adventive species from elsewhere. The dimensions agree better with this species rather than with the slenderer but closely related V. caloundrensis Cribb (1960, p. 16, pl. 5 figs 1–6) from south-eastern Queensland.
References:
BLUM, J.L. (1972). North American Flora, Ser. II, Part 8. Vaucheriaceae. (N.Y. Bot. Gard.)
CHRISTENSEN, T. (1986). Typification of the British salt- and brackish- water species of Vaucheria (Tribophyceae). Br. phycol. J. 21, 275–280.
CHRISTENSEN, T. (1987a). Seaweeds of the British Isles. Vol. 4. Tribophyceae (Xanthophyceae). (British Museum: London.)
CRIBB, A.B. (1960). Records of marine algae from south-eastern Queensland. V. Pap. Dep. Bot. Univ. Qld 4, 3–31.
TAYLOR, W.R. & BERNATOWICZ, A.J. (1952). Bermudian marine Vaucherias of the section Piloboloideae. Pap. Mich. Acad. Sci. Arts Lett. 37, 75–85, Plates 1–3.
THURET, G. (1854). Sur quelques Algues nouvelles. Mem. Soc. Sci. nat. de Cherbourg 2, 387–389.
VENKATARAMAN, G.S. (1961). Vaucheriaceae. Indian Council for Agric. Res., New Delhi. Monogr. Algae.
The Marine Benthic Flora of Southern Australia Part II complete list of references.
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. 169F.
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.
|
Email Contact: State Herbarium of South Australia |
|
