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Electronic Flora of South Australia Genus Fact Sheet

Genus COLACODASYA Schmitz in Schmitz & Falkenberg 1897: 473

Phylum Rhodophyta – Order Ceramiales – Family Dasyaceae

Thallus pulvinate to globular, 1–5 mm across, pale in colour, parasitic on species of Dasya or Heterosiphonia with rhizoids penetrating between the host cells, with a basal pseudoparenchymatous tissue and erect, surface, polysiphonous branches sympodially branched and with radially or distichously arranged pseudolaterals; laterals 1 or 2 segments apart; pericentral cells 4–6, in some species divided horizontally, often lightly corticated.

Reproduction: Gametophytes monoecious or dioecious. Procarps borne on basal cells of pseudolaterals which develop 5 pericentral cells, with a 4-celled carpogonial branch and sterile cells. Carposporophytes ovoid, sessile on polysiphonous bases, with a much branched gonimoblast bearing terminal chains of carposporangia, and a pericarp lightly corticated. Spermatangial branches developed from branches of pseudolaterals.

Tetrasporangial stichidia borne on branches of pseudolaterals, with 4–6 pericentral cells and tetrasporangia per whorl, each with 2 or 3 usually undivided cover cells.

Type species: C. inconspicua (Reinsch) Schmitz 1897: 473.

Taxonomic notes: A genus of 3 species, the type from the subantarctic and C. californica Hollenberg (1970, p. 65) from California, both parasitic on species of Heterosiphonia , and C. australica parasitic on Dasya clavigera on southern Australian coasts.

References:

HOLLENBERG, G.J. (1970). Phycological notes IV, including new marine algae and new records for California. Phycologia 9, 61–72.

SCHMITZ, F. & FALKENBERG, P. (1897). Rhodomelaceae. In Engler, A. & Prantl, K., Die nattirlichen Pflanzenfamilien. T.1. Abt. 2, pp. 421–480. (Englemann: Leipzig.)

The Marine Benthic Flora of Southern Australia Part IIIC complete list of references.

Author: M.J. Parsons and H.B.S. Womersley

Publication: Womersley, H.B.S. (24 December, 1998)
The Marine Benthic Flora of Southern Australia
Rhodophyta. Part IIIC. Ceramiales – Ceramiaceae, Dasyaceae
©State Herbarium of South Australia, Government of South Australia


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