Bryothamnion Kützing, 1843

Lectotype species: Bryothamnion seaforthii (Turner) Kützing

Currently accepted name for the type species: Alsidium seaforthii (Turner) J.Agardh

Original publication: 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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Type designated in: Schmitz, F. (1889). Systematische Übersicht der bisher bekannten Gattungen der Florideen. Flora oder Allgemeine botanische Zeitung 72: 435-456, pl. XXI.

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Description: Thalli erect from a rhizomatous holdfast, up to 20 cm tall, stiff branches often densely arranged; branches polysiphonous, cylindrical, triangular or flattened in section, with 6-9 pericentral cells, thickly corticated. Determinate branchlets on most segments, simple to pinnate, alternately arranged, on branch angles; distichously arranged if flattened; some ultimate branchlets may be spine-like. Branch apices with deciduous trichoblasts in 1/2 or 1/3 arrangement on every second segment; polysiphonous branches develop on proximal segment of trichoblast. Reproductive structures on determinate lateral branchlets. Tetrasporangia on ultimate adventitious branchlets, sometimes clustered in axils of branchlets. 1 per segment in a spiral series, often distorting the segment. Procarps on 2nd segment of trichoblast; cystocarps ovoid, often appearing to terminate short branchlets. Spermatangial capitula replacing trichoblasts, ovate, foliose, with sterile marginal cells.

Information kindly contributed by R.E. Norris but may now be outdated.

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

Most recent taxonomic treatment adopted: García-Soto, G. & Lopez-Bautista, J. (2018). Taxonomic notes on the genus Alsidium C. Agardh, including the merging of Bryothamnion Kützing (Rhodomelaceae). Algae. An International Journal of Algal Research 33(3): 215-229.

Comments: Western and eastern (African) tropical and sub-tropical Atlantic; Galapagos Is. and Pacific Mexico; subtidal.

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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Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in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=40574

Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 17 May 2019. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 24 November 2024