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Electronic Flora of South Australia Genus Fact Sheet
Phylum Rhodophyta – Order Ceramiales – Family Ceramiaceae – Tribe Monosporeae
Thallus erect, ecorticate, with a central axis bearing alternate distichous lateral branches for 2 orders, the third order largely adaxially branched, attached by the basal cell and rhizoids from the lower cells; cells multinucleate.
Reproduction: Propagules 3-celled, ovoid, with the central cell larger than the apical and basal cells, borne on a short stalk cell.
Gametophytes dioecious. Procarps on the subterminal cell of a 2–3-celled axis, with 3 periaxial cells, one being a supporting cell with a carpogonial branch and a terminal sterile cell. Post-fertilization 2 auxiliary cells are formed with the sterile procarp cells remaining undivided but a branched involucre arising from the hypogenous and subhypogenous cells; carposporophytes with 2 gonimolobes developed from the 2 auxiliary cells. Spermatangial heads formed in adaxial series on lateral branchlets.
Polysporangia are borne on lower cells of branchlets, sessile, with 24–36 spores.
Type species: D. levringii (Lindauer) Huisman & Kraft 1982: 179, figs 2–20.
Taxonomic notes: A monospecific genus distinguished by the distichous habit, presence of 3 periaxial cells on the subapical cell of the female axis, two auxiliary cells, an outer involucre, polysporangia and 3-celled propagules.
References:
HUISMAN, J.M. & KRAFT, G.T. (1982). Deucalion gen. nov. and Anisoschizus gen. nov. (Ceramiaceae, Ceramiales), two new propagule-forming red algae from southern Australia. .1. Phycol.18, 177–192.
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
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