Cystosphaera Skottsberg, 1907

Holotype species: Cystosphaera jacquinotii (Montagne) 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 to 3 m long attached by conical holdfast with radiating, branched haptera. Short, cylindrical stipe to 8 mm diameter. Main axis bears opposite, flat lateral branches. Marginal air bladders develop in the axils of some laterals. Growth from an apical meristem. Thallus is parenchymatous and differentiated into a meristoderm of small cells with numerous chloroplasts, a cortex of larger, vacuolate cells and a filamentous medulla. Life history is diplontic. Sexual reproduction is oogamous. Individuals are monoecious with terete receptacles to 12 mm long and 4 mm broad, on margins of main axis and adaxial margins of laterals. Conceptacles are uni- or bisexual containing antheridia and/or oogonia. Oogonia measure 70-150 µm and contain one egg. Antheridia are ellipsoid, 15-21 x 10-12 µm on branched paraphyses.

Information contributed by: M. N. Clayton. 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.

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: Cystosphaera is endemic to the Antarctic Peninsula and adjacent islands.

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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Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in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=42684

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 25 November 2024