Arthrocladia Duby, 1830

Holotype species: Arthrocladia villosa (Hudson) Duby

Original publication and holotype designation: Duby, J.É. (1830). Augusti Pyrami de Candolle Botanicon gallicum seu synopsis plantarum in flora gallica descriptarum. Editio secunda. Ex herbariis et schedis Candollianis. Pars secunda plantas cellulares continens. pp. vi, [545]-1068, lviii. Paris: VF Desray.

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Precise date of publication: May 1830

Description: Thallus erect, cylindrical, oppositely branched, to 2 mm in diameter and 1 m high. Epilithic, attached to substratum with a small discoid holdfast. Central axial filament throughout main axis and branches, with trichothallic growth form a sunterminal intercalary meristem. Terminal filament with whorls of 4 laterals. Below the meristem, the axial filament is corticated by means of downwardgrowing rhizoidal hyphae. Older thallus parts show the axial filament surrounded by a large-celled medulla and an outer, small-celled cortex. The thallus is clothed with whorls of fascicles of branched assimilatory filaments.Plastids lenticulate, without pyrenoid Phaeophycean hairs absent. Unilocular sporangia catenate, to 200 µm long consisting of 8-24 sporangia, each releasing 10-20 spores. Life history heteromorphic with macroscopic sporophyte and monoecious microscopic filamentous branched gametophytes. Male gametes are motile spermatozoids formed in clusters of club-shaped antheridia. Female gametes are oocytes formed in elongate oogonia. In culture, sporophytes were no result of fertilization, instead they developed parthenogenetically. The chromosome number counted in both gametophytes and sporophytes was n=23-27.

Information contributed by: A. F. Peters. The most recent alteration to this page was made on 2014-06-20 by M.D. Guiry.

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

Gender: This genus name is currently treated as feminine.

Most recent taxonomic treatment adopted: Silberfeld, T., Rousseau, F. & Reviers, B. de (2014). An updated classification of brown algae (Ochrophyta, Phaeophyceae). Cryptogamie Algologie 35(2): 117-156, 1 fig., 1 table.

Comments: Distributed in warm-temperate parts of the North Atlantic, the Mediterranean, and, possibly introduced, in southern Australia.

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Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in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. 20 June 2014. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway.; searched on 20 April 2024

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