Electronic Flora of South Australia Species Fact Sheet
Phylum Rhodophyta – Class Florideophyceae – Order Acrochaetiales – Family Acrochaetiaceae
Colaconema nakamurai Woelkerling 1971: 46, fig. 16.
Acrochaetium unifilum Levring 1953: 472, fig. 9 (NON Jao 1936: 239).
Thallus (Fig. 13A–D) epiphytic, attached to the substrate by means of a single cell the same size as or smaller than other cells, producing a single erect filament mostly 60–175 µm high with or without short, unbranched laterals. Cells (Fig. 13A–D) cylindrical, 3–5 µm in diameter and (4–) 6–9 µm long, L/D 1–1.5 (–2), each cell containing a single parietal rhodoplast (Fig. 13D) with one pyrenoid. Terminal hairs (Fig. 13A) occur.
Reproduction: Monosporangia (Fig. 13B–D) ovoid, 4–6 µm in diameter and 6–9 µm long, sessile or rarely on one-celled stalks, seriate, lateral or occasionally terminal. Other reproductive structures unknown.
Type from Cape du Couedic, Kangaroo I., S. Aust., on Delisea hypneoides; holotype in herbarium T. Levring, GOteborg, Sweden (?) [not listed by Andersson & Athanasiadis (1992)1; isotype in AD, A19847.
Distribution: Known only from the type locality.
This minute species is seemingly distinct but further collections are desirable for detailed comparisons.
ANDERSSON, R. & ATHANASIADIS, A. (1992). A catalog of taxa in the Phycological Herbarium of Göteborg. (Dept. Marine Bot., Göteborgs Univ.)
GARBARY, D.J. (1979b). Numerical Taxonomy and generic circumscription in the Acrochaetiaceae (Rhodophyta). Bot. Mar. 22, 477–492.
GARBARY, D.J. (1987). The Acrochaetiaceae (Rhodophyta): An annotated bibliography. Bibl. Phycol. 77, 1–267.
LEVRING, T. (1953). The marine algae of Australia. I. Rhodophyta: Goniotrichales, Bangiales and Némalionales. Arkiv för Bot. Ser. 2, 2, 457–530.
WOELKERLING, W.J. (1971). Morphology and taxonomy of the Audouinella complex (Rhodophyta) in southern Australia. Aust. J. Bot. Suppl. 1, 1–91.
The Marine Benthic Flora of Southern Australia Part IIIA complete list of references.
Womersley, H.B.S. (14 January, 1994)
The Marine Benthic Flora of Southern Australia
Rhodophyta. Part IIIA, Bangiophyceae and Florideophyceae (to Gigartinales)
Reproduced with permission from The Marine Benthic Flora of Southern Australia Part IIIA 1994, by H.B.S. Womersley. Australian Biological Resources Study, Canberra. Copyright Commonwealth of Australia.
Illustration in Womersley Part IIIA, 1994: FIG. 13 A–D.
Figure 13 enlarge
Fig. 13. A–D. Audouinella nakamurae (AD, A19847). A. Young thallus with a terminal hair. B–D. Mature thalli with monosporangia. E–G. Audouinella macula (AD, A31372). Mature thalli with monosporangia. H–L. Audouinella humilis (AD, A32114). H, I. Thalli with erect branches and monosporangia. J. Prostrate system (from below) with erect branches. K, L. Cells each with a rhodoplast and pyrenoid. M–Q. Audouinella spongicola (M, AD, A32125; N, P, Q, AD, A32127; 0, AD, A32126). M–P. Variation in cell length in the prostrate system. Q. Cells with rhodoplasts. [A-0 after Woelkerling 1971.]
State Herbarium of South Australia