Electronic Flora of South Australia Family Fact Sheet

ORDER ULOTRICHALES Borzi

Phylum Chlorophyta

Thallus of slender, unbranched, uniseriate filaments. Cells small, uninucleate; chloroplast single, parietal, band-shaped and often somewhat lobed or slightly reticulate, usually not occupying all of the cell wall, usually with one to a few pyrenoids.

Life history heteromorphic with an erect, usually macroscopic gametophyte producing in vegetative cells biflagellate gametes (isogametes, anisogametes or oogametes) or bi- or quad-spores, and a unicellular, microscopic sporophyte (Codiolum stage) producing quadriflagellate zoo(meio)spores.

Taxonomic notes: The order Ulotrichales is often (e.g. Scagel 1966, p. 26; Abbott & Hollenberg 1976, p. 54) considered to include families (e.g. Chaetophoraceae, Ulvaceae) which are here recognised as separate orders, following Round (1971), Kornmann & Sahling (1977) and Bold & Wynne (1978). The only family so far recognised in the southern Australian marine flora is the Ulotrichaceae.

The Codiolum stage has often been recorded as a separate taxon, and C. kuckuckii Skottsberg & Levring ex Levring (1941, p. 604, fig. 1A) was described from the apices of branches of the brown alga Splachnidium rugosum. This latter alga is widespread in sub-antarctic seas and occurs in south-eastern Australia, but there is no definite record of Codiolum in Splachnidium in Australia. The "record" of Levring (1941, p. 604) was apparently a generalisation from the distribution of Splachnidium.

References:

ABBOTT, I.A. & HOLLENBERG, G.J. (1976). Marine Algae of California. (Stanford Univ. Press: Stanford.)

BOLD, H.C. & WYNNE, M.J. (1978). Introduction to the Algae: Structure and reproduction. (Prentice-Hall: New Jersey.)

KORNMANN, P. & SAHLING, P.-H. (1977). Meeresalgen von Helgoländ. Benthische Grun-Braun-und Rotalgen. Helgoländer wiss. Meeresunters. 29, 1–292.

LEVRING, T. (1941). Die Meeresalgen der Juan Fernandez-Inseln. Nat. His. Juan Fernandez & Easter Is., Vol. 2, 601–670, Plates 49–53.

ROUND, F.E. (1971). The taxonomy of the Chlorophyta. II. Br. phycol. J. 6, 235–264.

SCAGEL, R.F. (1966). Marine algae of British Columbia and Northern Washington, Part I: Chlorophyceae (Green Algae). Natl Mus. Can. Bull. 207, i-viii, 1–257.

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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