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Electronic Flora of South Australia Genus Fact Sheet

Genus TANAKAELLA Itono 1977: 46

Phylum Rhodophyta – Order Ceramiales – Family Ceramiaceae – Tribe Monosporeae

Thallus erect, small, ecorticate, much branched irregularly subdichotomously from prostrate basal filaments, attached by branched haptera. Cells multinucleate.

Reproduction: Propagules ovoid, single celled, with a single small discoid basal cell.

Gametophytes dioecious. Procarps borne on the subapical cell of short axes, with 3 periaxial cells, one (the supporting cell) bearing a 4-celled carpogonial branch and a terminal sterile cell. Post-fertilization the supporting cells cuts off an auxiliary cell which produces successive gonimolobes, and 3 inner involucral filaments are formed from the apical cell, one periaxial cell, and either the second periaxial or the apical cell on the supporting cell. Spermatangial heads occur on median cells of the thallus.

Tetrasporangia occur on axial cells, subspherical, tetrahedrally divided.

Type species: T. japonica Itono 1977: 48,153,209,236,284, figs 24E–G, 44H–J, 52J–L, 66.

Taxonomic notes: T. japonica Itono, from Mageshima, Japan, was placed by Itono in the Sphondylothamnieae, but transferred by Huisman & Gordon-Mills (1994, p. 85) to the Monosporeae.

The genus is related to Mazoyerella Gordon-Mills & Womersley (1974) but differs in having tetrasporangia rather than polysporangia, and 3 periaxial cells on the female axis rather than 2.

The genus probably contains 3 species (Huisman & Gordon-Mills 1994, p. 85).


GORDON-MILLS, E.M. & WOMERSLEY, H.B.S. (1974). The morphology and life history of Mazoyerella gen. nov. (M. arachnoidea (Harvey) comb. nov. ), Rhodophyta, Ceramiaceae, from southern Australia. Br. phycol. J. 9, 127–137.

HUISMAN, J.M. & GORDON-MILLS, E.M. (1994). A proposal to resurrect the tribe Monosporeae Schmitz et Hauptfleisch, with a description of Tanakaella itonoi sp. nov. (Ceramiaceae, Rhodophyta) from southern and western Australia. Phycologia 33, 81–90.

ITONO, H. (1977). Studies on the Ceramiaceous algae (Rhodophyta) from southern parts of Japan. Bibliotheca Phycologia 35, 1–499.

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

Author: J.M. Huisman & 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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