Electronic Flora of South Australia Genus Fact Sheet

Genus ULOTHRIX Kützing 1833: 517

Phylum Chlorophyta – Order Ulotrichales – Family Ulotrichaceae

Thallus of slender unbranched filaments, basally attached by an elongate, rhizoidal cell. Cells short, usually about as long as broad; chloroplast a parietal band usually incompletely encircling the wall and often not reaching both cross walls, with one to a few pyrenoids.

Reproduction: Reproduction of the gametophytic filamentous thallus by quadriflagellate zoospores and biflagellate isogametes, liberated through a lateral pore in the cell wall from any cell except the basal one.

Life history haplontic as far as known, with zygotic meiospores in the Codiolum stage.

Lectotype species: U. tenuissimum Kützing.

Taxonomic notes: Only one species is currently reported from southern Australia, and its reproduction from living material has not been investigated. Other species probably occur since occasional consistently broader filaments are often present in material of U. subflaccida.


KÜTZING, F.T. (1833). Algologische Mittheilungen II. Über eine neue Gattung der Confervaceen ( Ulothrix Ktz.). Flora 16, 517–521.

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
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