152,876 species and infraspecific names are in the database, 20,938 images, 59,117 bibliographic items, 408,264 distributional records.

Mychodeophyllum Kraft, 1978

Classification:
Empire Eukaryota
Kingdom Plantae
Subkingdom Biliphyta
Phylum Rhodophyta
Subphylum Eurhodophytina
Class Florideophyceae
Subclass Rhodymeniophycidae
Order Gigartinales
Family Mychodeophyllaceae

Holotype species: Mychodeophyllum papillitectum Kraft

Original publication and holotype designation: Kraft, G.T. (1978). Studies of marine algae in the lesser-known families of the Gigartinales (Rhodophyta). III. The Mychodeaceae and Mychodeophyllaceae. Australian Journal of Botany 26: 515-610, 46 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: The genus has the characteristics of the family. Plants reach lengths of 15-20 cm overall, the blades borne on stalks to 5 cm in length. Probable closest alliances are with the Mychodeaceae, but the multiaxial structure and catenate carposporangia differ sufficiently to warrant placement in a separate family. Dixon (1982) rejected the family, but erred in any case by implying that Mychodeophyllum itself is synonymous with Mychodea, from which it is certainly generically distinct. A monospecific family in which plants are erect from a crustose base and consist of perennial, cartilaginous branched stalks and seasonal, laminar blades. Axes are multiaxial and consist of a medulla of mixed isodiametric cells and narrow filaments surrounded by a cortex in which many of the surface cells proliferate into short, papillar outgrowths. All but the surface cells are multinucleate and secondarily pit connected. Gametophytes are monoecious, polycarpogonial and procarpic, the inner cortical supporting cells bearing numerous 3-celled, outwardly directed carpogonial branches and acting as the auxiliary cell on diploidization by direct fusion with the fertilized carpogonium. Multiple gonimoblast initials are directed inwardly and grow as filaments along the border of the filamentous medulla and the cellular cortex. Carposporangia form outwardly radiating chains around the periphery of the sterile fiflamentous center. Cystocarps are stalked or sessile along blade margins and consist of a thick, non-ostiolate pericarp covered in papillae. Spermatangia occur in isolated clusters on groups of mother cells surrounding a basal cell. Tetrasporophytes are isomorphic with gametophytes and bear intercalary zonate tetrasporangia scattered across blade surfaces.

Information contributed by: G.T. Kraft. The most recent alteration to this page was made on 7 Oct 2010 by M.D. Guiry.

Comments: Distribution: Known only from a narrow latitudinal range along the coast of Western Australia. Despite being large and conspicuous, plants are presently known only from drift and have not been traced to their habitat.

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):

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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.

Created: 28 December 2000 by M.D. Guiry

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Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=39983

Citing AlgaeBase
Please cite this record as:
Guiry, M.D. & Guiry, G.M. 2018. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 18 September 2018.

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