160,132 species and infraspecific names are in the database, 22,604 images, 62,233 bibliographic items, 471,453 distributional records.

Macrothamnion Wollaston, 1968

Classification:
Empire Eukaryota
Kingdom Plantae
Subkingdom Biliphyta
Phylum Rhodophyta
Subphylum Eurhodophytina
Class Florideophyceae
Subclass Rhodymeniophycidae
Order Ceramiales
Family Ceramiaceae
Subfamily Ceramioideae
Tribe Antithamnieae

Holotype species: Macrothamnion pellucidum (Harvey) Wollaston

Original publication and holotype designation: Wollaston, E.M. (1968). Morphology and taxonomy of Southern Australian genera of Crouanieae Schmitz (Ceramiaceae, Rhodophyta). Australian Journal of Botany 16: 217-417, 42 figs, 10 pls, 1 table.
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Taxonomic status: currently recognized as a distinct genus.

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.

Description: Thallus to 30 cm, irregularly branched, rhizoidally corticated below, large plants felt-like at base. Axes with whorls of 3(2) simple or secundly-branched acute-tipped determinate branchlets on each cell, often with thorn-like processes on young cells. Gland cells on short branches near base of determinate branchlets. Procarps on basal (supporting) cells of determinate branchlets near branch apices. Carpogonial branch 4-celled, auxiliary cell, cut off from supporting cell, leading to development of carposporophyte with rounded groups of carposporangia and fusion between lower cells. Spermatangial clusters and tetrahedrally to cruciately divided tetrasporangia on gland cell bearing branches.

Information contributed by: E.M. Wollaston. The most recent alteration to this page was made on 6 Oct 2010 by M.D. Guiry.

Comments: Common on coasts of southern Australia. Easily recognized by regular whorls of determinate branchlets and gland-cells on special, short, branched branches on lower cells of branchlets.

Numbers of names and species: There are 4 species names in the database at present, of which 4 have been flagged as accepted taxonomically on the basis of the listed literature under the species name. In some instances, opinions on taxonomic validity differ from author to author and users are encouraged to form their own opinion. AlgaeBase is a work in progress and should not be regarded as a definitive source only as a guide to the literature..

Names: ('C' indicates a name that is accepted taxonomically; 'S' a homotypic or heterotypic synonym; 'U' indicates a name of uncertain taxonomic status, but which has been subjected to some verification nomenclaturally; 'P' indicates a preliminary AlgaeBase entry that has not been subjected to any kind of verification. For more information on a species click on it to activate a link to the Species database):

Click here to also show infraspecific names in the list below.

References
Wynne, M.J. & Schneider, C.W. (2010). Addendum to the synoptic review of red algal genera. Botanica Marina 53: 291-299.

Verification of data
Users are responsible for verifying the accuracy of information before use, as noted on the website Content page.

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.

Created: 30 December 2000 by M.D. Guiry

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Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=40356

Citing AlgaeBase
Please cite this record as:
Guiry, M.D. & Guiry, G.M. 2021. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 04 March 2021.

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