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.

References:

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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