Electronic Flora of South Australia Genus Fact Sheet

Genus UROSPORA Areschoug 1866: 15, nom. cons.

Phylum Chlorophyta – Order Acrosiphoniales – Family Acrosiphoniaceae

Thallus (gametophyte) of slender to coarse, unbranched filaments, basally attached to solid substrates by an elongate basal cell and rhizoids descending from the lower few cells. Cells multinucleate, L/B from less than 1 to 4 (–6); chloroplast single, parietal, continous but perforate, with several polypyramidal pyrenoids; cell wall often mucoid and filaments slippery. Sporophyte the unicellular Codiolum stage.

Reproduction: Reproduction by biflagellate anisogametes (gametophytes unisexual) and by quadriflagellate meiospores from the sporophyte; also parthenogenetic.

Life history diplohaplontic and heteromorphic, with the gametophyte filamentous and the sporophyte as the Codiolum stage.

Type species: U. mirabilis Areschoug [= U. penicilliformis (Roth) Areschoug].

Taxonomic notes: A genus of about 10 species. A single record of Urospora is known from Tasmania, and is provisionally referred to the cold temperate species U. penicilliformis; some authors prefer to use the name U mirabilis for what is probably the same taxon.


ARESCHOUG, J.E. (1866). Observationes Phycologicae I. Act. Reg. Soc. Sci. Upsala, Ser. III, 6. 1–26, Plates 1–4.

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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