Oerstedtia Trevisan, 1848

Holotype species: Oerstedtia australis (Endlicher & Diesing) Trevisan

Currently accepted name for the type species: Oerstedtia scalaris (Suhr) Jensen

Original publication and holotype designation: Trevisan, V.B.A. (1848). Saggio di una monografia delle Alghe Coccotalle. pp. 1-112. Padova [Padua]: coi tipi del seminario.

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Description: Plants to 70 cm in length, with a somewhat woody conical holdfast producing a short (to 12 cm) subterete perennial main axis bearing much longer primary laterals (to 5 mm wide) in a bilateral distichous arrangement, which are strongly compressed but not foliaceous. Laterals are without a midrib, entire, linear-elongate, subterete at their base. Vesicles absent. Apical cells 3-sided, positioned at the base of a narrow, slit-like apical pit. Most of the secondary laterals become determinate fertile axes, to 3 cm in length, subtended by a leaf. Receptacular clusters produced laterally and distichously on fertile axes, made up of a number of terete branched axes (1-2 mm long) bearing swollen receptacles terminally (to 1 mm diameter x 1.5 mm long). Plants monoecious, bearing unisexual conceptacles. On a single receptacle the terminal few conceptacles are male, with numerous branched antheridial filaments, and the others female; one egg per oogonium. Single species O. scalaris endemic to Agulhas marine province on the south coast of South Africa, subtidal.

Information contributed by: J. J. Bolton. The most recent alteration to this page was made on 2014-06-21 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.

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Contributors
Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in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.

Linking to this page: https://www.algaebase.org/search/genus/detail/?genus_id=42965

Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 21 June 2014. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 22 December 2024