Phaeurus Skottsberg, 1907

Holotype species: Phaeurus antarcticus Skottsberg

Original publication and holotype designation: Skottsberg, C. (1907). Zur Kenntnis der subantarktischen und antarktischen Meeresalgen. I. Phaeophyceen. In: Wissenschaftliche Ergebnisse der Schwedischen Südpolar-Expedition 1901-1903 unter Leitung von Dr. Otto Nordenskjöld. Vol. 4: 1, Part 6. ( Eds), pp. 1-172. Stockholm: Lithographisches Institut des Generalstabs.

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Description: Thallus erect, cylindrical, to 1.5 mm in diam. and to 1 m high, flexible, sparsely oppositely branched, epilithic. Attached to substratum with a discoid holdfast to 1 cm in diameter. The thallus has a main axial longitudinal filament surrounded by a sheath of intertwined thin pigmented hyphae, by a thick unpigmented medulla and a cortex of pigmented cells. Growth of the axial filament in juvenile individuals from a subterminal intercalary filament. In older individuals the terminal filament is lost and the meristem is apical. Medulla cells are elongate and are formed by downward-growing hyphae, becoming isodiametric towards the cortex. Cortical cells are small, isodiametric, containing numerous lenticulate plastids without pyrenoids. The whole thallus is clothed by a fur-like covering of densely pigmented assimilatory filaments to 3 mm in length.that originate in the outer cortical layer. Assimilatory filaments are simple, straight, consist of cylindrical cells 30-70 µm in diameter and have a basal meristem. Phaeophycean hairs absent.

Catenate unilocular sporangia are formed in older thallus parts in sori together with clavate paraphyses 200 µm in length from outer cortical cells. Sporangial filaments are up to 200 µm in length and cosist of 6-8 cylindrical to elongate-ovoid sporangia each containing 16 spores. Life history heteromorphic with macroscopic sporophyte and microscopic filamentous branched dioecious gametophytes.

Gametophytes are sexually dimorphic, male filaments to 10 µm and female to 30 µm in diameter. Male gametes are motile spermatozoids formed in clusters of club-shaped antheridia. Female Gametes are oocytes formed in elongate oogonia.

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.

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: Endemic to the Antarctic Peninsula.

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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 19 June 2024

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