Stypocaulon Kützing, 1843

Holotype species: Stypocaulon scoparium (Linnaeus) Kützing

Currently accepted name for the type species: Halopteris scoparia (Linnaeus) Sauvageau

Original publication and holotype designation: Kützing, F.T. (1843). Phycologia generalis oder Anatomie, Physiologie und Systemkunde der Tange. Mit 80 farbig gedruckten Tafeln, gezeichnet und gravirt vom Verfasser. pp. [part 1]: [i]-xxxii, [1]-142, [part 2:] 143-458, 1, err.], pls 1-80. Leipzig: F.A. Brockhaus.

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Precise date of publication: None

Description: Plants forming 3-20 (-30) cm tall, reddish brown or dark brown to olivaceous, usually epiphytic, erect tufts; heterotrichous. Basal parts consisting of a small or extensive polystromatic disc or of a holdfast of matted, descending, corticating rhizoids. Discs and rhizoids do not occur in unattached, free-living plants. Erect, terete, articulate, leptocaulous, much branched axes with acroheteroblastic, irregularly distichous-alternatly or irregularly radially placed, usually determinate laterals, up to the fourth order. Forming one lenticular branch initial from each conspicuous cylindrical apical cell before a segment is cut off. Segments each dividing transversally once preceeding frequent longitudinal and transverse segmentation. Internal structure of larger medullary cells covered by a small-celled cortex, which is usually further corticated by descending corticating rhizoids. Hairs usually in groups, in axils of laterals. Pericysts are frequent. Reproductive structures: clustered plurilocular antheridia and unilocular oogonia and clustered unilocular zoidangia. Cosmopolitan marine in lower intertidal and sublittoral, usually in temperate regions. Representatives of this genus are, in some localities, the dominant seaweeds forming extensive vegetations. Unattached forms occur in brackish seas and in seagrass meadows in Europe. These sterile forms propagate only by fragmentation. The diplohaplontic life history is isomorphic, oogamous and monoecious. Most plants are sporophytes, gametophytes occur only occasionally. Parthenogenesis has been observed. Basic chromosome number (for S. scoparium) 16 according to Higgins (1931).

Information kindly contributed by J. A. Phillips and R. J. King but may now be outdated.

Taxonomic status: This name is currently regarded as a synonym of Halopteris.

Gender: This genus name is currently treated as masculine.

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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.

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Citing AlgaeBase
Cite this record as:
Michael Guiry in Guiry, M.D. & Guiry, G.M. 08 June 2012. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 01 October 2022

 
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