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Electronic Flora of South Australia Genus Fact Sheet
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.
Publication:
Womersley, H.B.S. (31 May, 1984)
The Marine Benthic Flora of Southern Australia
Part I
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