Antarcticothamnion R.L.Moe & P.C.Silva, 1979

Holotype species: Antarcticothamnion polysporum R.L.Moe & P.C.Silva

Original publication and holotype designation: Moe, R.L. & Silva, P.C. (1979). Morphological and taxonomic studies on Antarctic Ceramiaceae (Rhodophyceae). I. Antarcticothamnion polysporum gen. et sp. nov.. British Phycological Journal 14: 385-405.

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Precise date of publication: 3 Dec 1979

Description: Thallus to 6 cm, with monosiphonous, erect axes. Apical cells divide by oblique septa to produce alternate-distichous determinate branchlets, curved at first, becoming reflexed when mature. Indeterminate branches at intervals in whorls consisting of 1 determinate branchlet and 1-3 indeterminate branches. Axes corticated below with decurrent branched rhizoids. Cells-multinucleate. Procarps 2-4 cells below branch apices, 2 uninucleate pericentral cells at right angles to one another with sterile cell and carpogonial branch on first formed pericentral cell (= supporting cell). Each pericentral cell cuts off an auxiliary cell and either or both fuse with a connecting cell from the carpogonium and form carposporophyte surrounded by involucral branches from the axial cell below. Spermatangia in loose heads. Sporangia polyhedrally divided.

Information contributed by: E.M. Wollaston & M.D. Guiry. The most recent alteration to this page was made on 2010-10-05 by M.D. Guiry.

Taxonomic status: This name is of an entity that is currently accepted taxonomically.

Most recent taxonomic treatment adopted: Schneider, C.W. & Wynne, M.J. (2007). A synoptic review of the classification of red algal genera a half a century after Kylin's "Die Gattungen der Rhodophyceen". Botanica Marina 50: 197-249.

Comments: Recorded only from South Shetland Islands and Antarctic Peninsula usually growing on a bryozoan epiphytic on Phyllophora ahnfeltioides Kylin and Myriogramme manginii Gain in clear offshore water, 13-16 m deep, October to January. All plants epiphytized by diatoms and the green alga Entocladia. Transfer of Antarcticothamnion to tribe Compsothamnieae has been proposed.

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Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in CD format. These AlgaeBase descriptions are now being continually updated, and each current contributor is identified above. The PSA and AlgaeBase warmly acknowledge the generosity of all past and present contributors and particularly the work of Dr Parker.

Descriptions of chrysophyte genera were subsequently published in J. Kristiansen & H.R. Preisig (eds.). 2001. Encyclopedia of Chrysophyte Genera. Bibliotheca Phycologica 110: 1-260.

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M.D. Guiry in Guiry, M.D. & Guiry, G.M. 05 October 2010. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway.; searched on 27 February 2024

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