Geminocarpus Skottsberg, 1907

Holotype species: Geminocarpus geminatus (Hooker f. & Harvey) 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: The slightly irregular bipinnate branching pattern is characteristic for the genus. Single or adjacent cells in the uniseriate macrothallus are divided longitudinally at irregular intervals. Each of the 2 cells formed by this process develops into a lateral; when this occurs from adjacent cells there is a basipetal length decrease of the laterals, i.e. the uppermost pair in such a series is the oldest. In well-developed plants, first order laterals may undergo a similar branching pattern. Plurilocular sporangia are formed by transformation of short laterals on main axis and laterals. Sporangia opposite or opposite a vegetative branch. Unilocular sporangia formed by transformation of unicellular laterals. The subdivisions in the parental cell take place after it is closed by a wall. Unilocular sporangia also occur terminally on a short stalk. Life history unknown.

Information contributed by: P. M. Pedersen. 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: This is an austral genus. Ricker (1987) gives further details on geographic distribution.

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Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in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 16 June 2024

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