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Electronic Flora of South Australia Genus Fact Sheet

Genus RADIATHAMNION Gordon-Mills & Kraft 1981: 129

Phylum Rhodophyta – Order Ceramiales – Family Ceramiaceae – Tribe Radiathamnieae

Thallus small, epiphytic in the apical pits of Laurencia spp., attached by a single basal cell, with a curved primary axis bearing unilaterally secondary branches on the convex side, branches irregularly branched and tapering to hair-like, often caducous, ends. Cells uninucleate.

Reproduction: Gametophytes dioecious. Procarps borne on the basal cell of 2–3-celled laterals, with a 4-celled carpogonial branch; post-fertilization the auxiliary (or supporting) cell fuses with the axial cell and produces a terminal and usually 2 lateral gonimolobes, surrounded by involucral branchlets from lower axial cells. Spermatangial heads elongate, often in pairs from branchlet cells, with spermatangia cut off directly from axial cells of the heads.

Tetrasporangia lateral on small-celled branchlets on the lateral branches, sessile, tetrahedrally divided.

Type (and only) species: R. speleotis Gordon-Mills & Kraft 1981: 129, figs 1–23.

References:

GORDON-MILLS, E.M. & KRAFT, G.T. (1981). The morphology of Radiathamnion speleotis gen. et sp. nov., representing a new tribe in the Ceramiaceae (Rhodophyta) from southern Australia. Phycologia 20, 122–130.

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

Author: 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
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