Medeiothamnion Pujals, 1970

Holotype species: Medeiothamnion sanctacrucense Pujals

Original publication and holotype designation: Pujals, C. (1970). Medeiothamnion nuevo género de Ceramiaceae. Revista del Museo Argentino de Ciencias Naturales "Bernardino Rivadavia" e Instituto Nacional de Investigacion de las Ciencias Naturales (Botanica) 3(10): 287-299.

Description: Thallus with prostrate and erect axes to 3O cm, branching irregular to alternately subdistichous, usually with rhizoidal cortication. Axial cells with whorls of 2-5 pinnately to subdichotomously branched determinate branchlets. Procarps subapical on short lateral branchlets, carpogonial branches 4-celled on one (supporting cell) of 3 pericentral cells. Following fusion of enlarged cells of carpogonial branch the auxiliary cell, cut off from supporting cell, leads to development of carposporophyte with successive development of carposporangial groups and surrounding involucral filaments. Spermatangial heads on cells of determinate branchlets. Tetrasporangla on inner cells of branchlets, tetrahedrally divided. Distinguished from other genera of Sphondylothamnieae by form of hypogenous cell, single auxiliary cell per procarp and multinucleate gonimolobe cells.

Information contributed by: E.M. Wollaston. The most recent alteration to this page was made on 2010-10-06 by M.D. Guiry.

Taxonomic status: This name is of an entity that is currently accepted taxonomically.

Most recent taxonomic treatment adopted: Schneider, C.W. & Wynne, M.J. (2007). A synoptic review of the classification of red algal genera a half a century after Kylin's "Die Gattungen der Rhodophyceen". Botanica Marina 50: 197-249.

Comments: Includes several species removed from Wrangelia. Most records from southern Australia, also from Santa Cruz, Argentine (type species), New Zealand and southern 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Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in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=40358

Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 06 October 2010. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 18 December 2024