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Electronic Flora of South Australia Genus Fact Sheet

Genus ULVARIA Ruprecht 1851: 410

Phylum Chlorophyta – Order Ulvales – Family Ulvaceae

Thallus membranous, tubular when very young but soon opening out and remaining monostromatic throughout, attached by rhizoids from basal cells. Cells isodiametric to elongate; chloroplast parietal, laminate, filling part or most of the cell, with one to several pyrenoids.

Reproduction: Generations isomorphic, the sporophyte producing quadriflagellate zoo (meio) spores and gametophyte isogametes or anisogametes; or by biflagellate zoo (mito) spores from a single generation.

Lectotype species: U obscura (Kützing) Gayral (see Bliding 1968, p. 582).

Taxonomic notes: A genus of some 4 species, separated from Monostrotna since the latter genus has a multicellular, membranous gametophyte but a single-celled ("Codiolum phase") sporophyte, whereas Ulvaria is basically isomorphic though one generation may not occur in some species. U. oxysperma has been made the type species of Gayralia Vinogradova (1969, p. 1354), but is referred to Ulvaria by most authors.


BLIDING, C. (1968). A critical survey of European taxa in Ulvales, II. Ulva, Ulvaria. Monostroma, Kornmannia. Bot. Notiser 121, 535–629.

RUPRECHT, F.J. (1851). Tange des ochotskischen Meeres. In A. T. von Middendorff, Reise in den äussersten Norden und Osten Sibiriens während der Jahre 1843 und 1844. Vol. 1 (2), Botanik, 191–435, Plates 9–18. (St Petersburg.)

VINOGRADOVA, K.L. (1969). A contribution to the taxonomy of the order Ulvales (Chlorophyta). Bot. Zh. SSSR 54, 1347–1355.

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


1. Thallus about as broad as long, maring often ruffled; growing in intertidal habitats

U. oxysperma

1. Thallus laciniate, forming ribbons many time longer than broad, margin smooth; from deep water habitats

U. shepherdii

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