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Order Acrochaetiales

Family Acrochaetiaceae

Acrochaetium reductum (Rosenvinge) G.Hamel 1927: 95

Plants minute, erect parts usually under 30 µm tall. Gametophytes with a unicellular base and one to three erect filaments; axes up to ca. 5 cells long. Tetrasporophytes with an extensive multicellular filamentous basal system originating from a septately germinated spore; septation pattern typically two-celled. Erect filament very short, usually no more than three cells, often sporangia sessile on the prostrate filaments. Erect filaments 4-6 µm in diameter, cells about as long as broad. Monosporangia terminal or lateral, or sessile on the prostrate filaments, 5-8 x 4-5 µm.

Collections, ecology and regional distribution

Recorded from False Bay to Haga Haga (17-42). Epiphytic on various algae in the lower eulittoral and tide pools.

World distribution: Also recorded from Namibia, Europe and Iceland (Guiry & Guiry 2014).

Type locality: “Kattegat, between Sweden and Denmark Type: C?” (Athanasiadis 1996, cited in Guiry & Guiry 2014).

Note: also known from Namibia, Europe and Iceland (Guiry & Guiry 2014).


Acrochaetium reductum. 1. Young tetrasporophytes. 2. Tetrasporophyte with monosporangia.3. Gametophyte with monosporangia. (Illustrations reproduced from Stegenga et al. 1997).


References Acrochaetium reductum

Athanasiadis, A. (1996). Taxonomisk litteratur och biogeografi av Skandinaviska rödalger och brunalger. pp. 1-280. Göteborg: Algologia.

Hamel, G.. (1927). Recherches sur les genres Acrochaetium Naeg. et Rhodochorton Naeg. Published Ph.D. thesis. pp. i-v, 1-117. Saint-Lô: Imprimerie R. Jaqueline, rue des Images, 23.

Guiry W. in Guiry, M.D. & Guiry, G.M. 2014. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway.; searched on 21 October 2014.

Stegenga, H., Bolton, J.J. and R. J. Anderson. 1997. Seaweeds of the South African west coast. Contributions from the Bolus Herbarium 18: 655 pp.


Cite this record as:

Anderson RJ, Stegenga H, Bolton JJ. 2016. Seaweeds of the South African South Coast.
World Wide Web electronic publication, University of Cape Town,; Accessed on 26 February 2024.