Melanema Min-Thein &, 1976
Holotype species: Melanema dumosum (Harvey) Min-Thein & Womersley
Original publication and holotype designation: Min-Thein, U. & Womersley, H.B.S. (1976). Studies on southern Australian taxa of Solieriaceae, Rhabdoniaceae and Rhodophyllidaceae (Rhodophyta). Australian Journal of Botany 24: 1-166, 69 figs.
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: Plants reach 10 cm in length and are erect, generally in clusters from a discoid base, terete, and irregularly branched. Apices are uniaxial, each axial cell bearing a single periaxial fascicle. The medulla is filamentous, with rhizoidal filaments surrounding the prominent central axial filament. Gametophytes are monoecious. Carpogonial branches are 3-celled, directed outwardly, and may bear a sterile cell on the basal cell. Auxiliary cells appear to be located distal and adjacent to the supporting cells, presumably in a procarpic relationship. Gonimoblast initials are single and inwardly directed. Following diploidization, the young gonimoblasts are surrounded by nutritive cells borne on adjacent cortical cells, although at maturity the carposporophyte is apparently not surrounded by a filamentous hull. Inner gonimoblast cells and the auxiliary cell are incorporated into a linear fusion cell that is lateral to the central axial filament. Inner gonimoblast filaments radiating from the fusion cell bear chains of up to 4 carposporangia, the carpospores escaping through an ostiole in the hemispherically protruding pericarp. Tetrasporangia are basally pit-connected.
Information contributed by: G.T. Kraft. The most recent alteration to this page was made on 8 Oct 2010 by M.D. Guiry.
Comments: Despite the anomalies of uniaxial structure and apparent possession of procarps, Gabrielson and Hommersand (1982a) have transferred Melanema from the Caulacanthaceae, where it was placed by Min-Thein and Womersley (1976, as the Rhabdoniaceae) to the Solieriaceae, as a member of the tribe Areschougieae. Distribution: Endemic to southern Australia, where it occurs on rocks on open coasts from low intertidal pools to at least 20 m depths.
Numbers of names and species: There is only one species or infraspecific name in the database at present, which has 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.
Verification of data
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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.
Created: 28 December 2000 by M.D. Guiry
Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=42808
Please cite this record as:
Guiry, M.D. & Guiry, G.M. 2019. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 19 January 2019.