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Electronic Flora of South Australia Family Fact Sheet
Phylum Rhodophyta – Order Ceramiales – Family Ceramiaceae
Thallus usually erect, subdichotomous or laterally branched, axial cells with 3–10 periaxial cells from their upper ends, producing acropetal and usually basipetal rows of corticating cells which adhere closely to the axial cells and may produce an outer cortex also of small, more or less isodiametric cells.
Reproduction: Gametophytes usually dioecious. Carpogonial branches formed on periaxial cells near apices, 4-celled usually with a sterile group. Carposporophytes with 1 to several rounded gonimolobes, all cells forming carposporangia, naked or involucrate by branches from below. Spermatangia cut off from periaxial or the corticating cells.
Tetrasporangia cut off from periaxial or corticating cells, usually decussately divided.
Life history triphasic with isomorphic gametophytes and tetrasporophytes.
Type genus: Ceramium Roth 1797: 146.
Taxonomic notes: A tribe with about 9 genera (Kylin 1956, pp. 368, 369), of which Ceramium Roth and Centroceras Kützing occur on southern Australian coasts. These genera are readily recognised vegetatively by the characteristic nodal development of periaxial and corticating cells.
References:
KYLIN, H. (1956). Die Gattungen der Rhodophyceen. (Gleerups: Lund.)
ROTH, A.G. (1797). Catlecta botanica quibus plantae novae et minus cognitae describunter atque illustrantur. Fasc. 1. (Lipsiae.)
SCHMITZ, F. (1889). Systematische Ubersicht der bisher bekannten Gattungen der Florideen. Flora, Jena 72, 435–456, Plate 21.
The Marine Benthic Flora of Southern Australia Part IIIC complete list of references.
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
KEY TO GENERA OF CERAMIEAE
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1. Periaxial and cortical cells rounded, not forming straight rows of angular cells, with successive nodes at first or throughout separated, leaving ecorticate internodal bands; spermatangia cut off from corticating cells | CERAMIUM |
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1. Periaxial cortical cells rectilinear, forming straight longitudinal rows of angular cells, completely covering axial cells with no ecorticate bands; spermatangia on clusters originating from periaxial cells | CENTROCERAS |
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